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154 vulnerabilities by bytecodealliance
CVE-2026-115893 (GCVE-0-2026-115893)
Vulnerability from nvd – Published: 2026-10-23 21:29 – Updated: 2026-10-23 21:29
VLAI
EPSS
VEX
Title
Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction
Summary
Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4.
Severity
9.9 (Critical)
CWE
- CWE-691 - Insufficient Control Flow Management
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | x_refsource_CONFIRM |
| https://github.com/bytecodealliance/wasmtime/pull/14818 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14819 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14820 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14826 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
< 36.0.19
Affected: >= 37.0.0, < 48.0.7 Affected: >= 49.0.0, < 49.0.4 |
{
"containers": {
"cna": {
"affected": [
{
"product": "wasmtime",
"vendor": "bytecodealliance",
"versions": [
{
"status": "affected",
"version": "\u003c 36.0.19"
},
{
"status": "affected",
"version": "\u003e= 37.0.0, \u003c 48.0.7"
},
{
"status": "affected",
"version": "\u003e= 49.0.0, \u003c 49.0.4"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.9,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-691",
"description": "CWE-691: Insufficient Control Flow Management",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-23T21:29:33.917Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/14818",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/14818"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/14819",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/14819"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/14820",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/14820"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/14826",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/14826"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4"
}
],
"source": {
"advisory": "GHSA-mghf-wjfp-p5xm",
"discovery": "UNKNOWN"
},
"title": "Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-115893",
"datePublished": "2026-10-23T21:29:33.917Z",
"dateReserved": "2026-10-23T19:37:27.177Z",
"dateUpdated": "2026-10-23T21:29:33.917Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-115892 (GCVE-0-2026-115892)
Vulnerability from nvd – Published: 2026-10-23 21:26 – Updated: 2026-10-23 21:26
VLAI
EPSS
VEX
Title
Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type
Summary
Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4.
Severity
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | x_refsource_CONFIRM |
| https://github.com/bytecodealliance/wasmtime/pull/14819 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14820 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14827 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
>= 46.0.0, < 48.0.7
Affected: >= 49.0.0, < 49.0.4 |
{
"containers": {
"cna": {
"affected": [
{
"product": "wasmtime",
"vendor": "bytecodealliance",
"versions": [
{
"status": "affected",
"version": "\u003e= 46.0.0, \u003c 48.0.7"
},
{
"status": "affected",
"version": "\u003e= 49.0.0, \u003c 49.0.4"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 5.7,
"baseSeverity": "MEDIUM",
"privilegesRequired": "HIGH",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-843",
"description": "CWE-843: Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-248",
"description": "CWE-248: Uncaught Exception",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-23T21:26:54.528Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/14819",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/14819"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/14820",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/14820"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/14827",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/14827"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4"
}
],
"source": {
"advisory": "GHSA-9pvw-hwfg-92h5",
"discovery": "UNKNOWN"
},
"title": "Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-115892",
"datePublished": "2026-10-23T21:26:54.528Z",
"dateReserved": "2026-10-23T19:37:27.176Z",
"dateUpdated": "2026-10-23T21:26:54.528Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-115889 (GCVE-0-2026-115889)
Vulnerability from nvd – Published: 2026-10-23 21:23 – Updated: 2026-10-26 17:42
VLAI
EPSS
VEX
Title
Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation
Summary
Wasmtime is a runtime for WebAssembly. Prior to 36.0.19 and 43.0.0, the Cranelift compiler backend bit-packs SSA value indices in a way that can silently overflow in release builds when compiling a sufficiently large or specially crafted Wasm function with many SSA values. The overflow can make Cranelift reference incorrect IR values, causing arbitrary miscompilation, type confusion, and other attacker-controlled effects that may escape the Wasm sandbox on any architecture using the default Cranelift backend. This issue is fixed in versions 36.0.19 and 43.0.0.
Severity
9.9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 15:40 UTC
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | x_refsource_CONFIRM |
| https://github.com/bytecodealliance/wasmtime/pull/12613 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14818 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
< 36.0.19
Affected: >= 37.0.0, < 43.0.0 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-115889",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
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"timestamp": "2026-10-26T15:40:36.390562Z",
"version": "2.0.3"
},
"type": "ssvc"
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"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "wasmtime",
"vendor": "bytecodealliance",
"versions": [
{
"status": "affected",
"version": "\u003c 36.0.19"
},
{
"status": "affected",
"version": "\u003e= 37.0.0, \u003c 43.0.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Wasmtime is a runtime for WebAssembly. Prior to 36.0.19 and 43.0.0, the Cranelift compiler backend bit-packs SSA value indices in a way that can silently overflow in release builds when compiling a sufficiently large or specially crafted Wasm function with many SSA values. The overflow can make Cranelift reference incorrect IR values, causing arbitrary miscompilation, type confusion, and other attacker-controlled effects that may escape the Wasm sandbox on any architecture using the default Cranelift backend. This issue is fixed in versions 36.0.19 and 43.0.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.9,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
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"description": "CWE-197: Numeric Truncation Error",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-843",
"description": "CWE-843: Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
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},
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{
"name": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-fmxm",
"tags": [
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],
"url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-fmxm"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/12613",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/12613"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/pull/14818",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/pull/14818"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/ba8f7d70caa1825b7f64fa75cd9d03f4a438dae0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/ba8f7d70caa1825b7f64fa75cd9d03f4a438dae0"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19"
},
{
"name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v43.0.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v43.0.0"
}
],
"source": {
"advisory": "GHSA-897f-g5gm-fmxm",
"discovery": "UNKNOWN"
},
"title": "Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation"
}
},
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"cveId": "CVE-2026-115889",
"datePublished": "2026-10-23T21:23:27.669Z",
"dateReserved": "2026-10-23T19:37:27.176Z",
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"state": "PUBLISHED"
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}
CVE-2026-115393 (GCVE-0-2026-115393)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 Cross-Engine Type Confusion
Summary
Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixing objects between Engines via Instance::new, StructRefPre::new, or Tag::new can trigger trampoline signature mismatches causing out-of-bounds stack writes, GC heap corruption, or panics.
Severity
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 24.0.12
(semver)
Unaffected: 24.0.12 (semver) Affected: 25.0.0 , < 36.0.13 (semver) Unaffected: 36.0.13 (semver) Affected: 37.0.0 , < 46.0.2 (semver) Unaffected: 46.0.2 (semver) Affected: 47.0.0 , < 47.0.3 (semver) Unaffected: 47.0.3 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-07-31 00:00
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CVE-2026-115392 (GCVE-0-2026-115392)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 Sandbox Escape via Trailing Slashes
Summary
Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 allows a filesystem sandbox escape in wasmtime-wasi because its cap-std dependency mishandles symlinks with trailing slashes on macOS and Linux kernels lacking openat2. A guest with write access to any sandboxed directory can read and write any host-accessible file, and read-only guests may read host files via preexisting symlinks.
Severity
CWE
- CWE-61 - UNIX Symbolic Link (Symlink) Following
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 24.0.13
(semver)
Unaffected: 24.0.13 (semver) Affected: 25.0.0 , < 36.0.14 (semver) Unaffected: 36.0.14 (semver) Affected: 37.0.0 , < 46.0.3 (semver) Unaffected: 46.0.3 (semver) Affected: 47.0.0 , < 47.0.4 (semver) Unaffected: 47.0.4 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-08-20 00:00
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CVE-2026-115391 (GCVE-0-2026-115391)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbounded Heap Allocation via WASIp3 Streams
Summary
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.
Severity
5.8 (Medium)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-46.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
46.0.0 , < 46.0.3
(semver)
Unaffected: 46.0.3 (semver) Affected: 47.0.0 , < 47.0.4 (semver) Unaffected: 47.0.4 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-08-20 00:00
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CVE-2026-115390 (GCVE-0-2026-115390)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-23 15:00
VLAI
EPSS
VEX
Title
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS
Summary
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths. Malicious guests can reset consumed fuel after calls to run exponentially long on linear fuel, evading timeouts and periodic yields for denial of service.
Severity
5.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 14:48 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-47.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
47.0.0 , < 48.0.3
(semver)
Unaffected: 48.0.3 (semver) Affected: 49.0.0 , < 49.0.1 (semver) Unaffected: 49.0.1 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-09-24 00:00
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CVE-2026-115389 (GCVE-0-2026-115389)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Denial of Service via Val API
Summary
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 36.0.16
(semver)
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Date Public
2026-09-24 00:00
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CVE-2026-115388 (GCVE-0-2026-115388)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Memory Exhaustion DoS via wasmtime-wasi-http Outgoing Body Write
Summary
wasmtime-wasi-http in Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not enforce the wasi:io/streams check-write allowance for WASIp2 outgoing HTTP bodies, so oversized writes succeed instead of trapping. A malicious guest can pass large buffers to write on outgoing-body resources, holding host allocations for the store's lifetime and exhausting host memory.
Severity
6.2 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 36.0.16
(semver)
Unaffected: 36.0.16 (semver) Affected: 37.0.0 , < 48.0.3 (semver) Unaffected: 48.0.3 (semver) Affected: 49.0.0 , < 49.0.1 (semver) Unaffected: 49.0.1 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-09-24 00:00
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CVE-2026-115387 (GCVE-0-2026-115387)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Host Panic via WASI Filesystem Timestamp Overflow
Summary
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 contains a denial of service vulnerability in wasmtime-wasi that allows guest WASI programs to panic the host via overflowing filesystem timestamps. Attackers can pass atim or mtim values whose sub-second field overflows the seconds field to path_filestat_set_times, fd_filestat_set_times, set-times, or set-times-at, crashing the host.
Severity
6.2 (Medium)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 36.0.16
(semver)
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Date Public
2026-09-24 00:00
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CVE-2026-115386 (GCVE-0-2026-115386)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-23 15:00
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure via fd_readdir
Summary
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fd_readdir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of leftover host stack or heap memory per directory entry.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 14:48 UTC
CWE
- CWE-908 - Use of Uninitialized Resource
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
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Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
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(semver)
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Date Public
2026-10-02 00:00
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CVE-2026-115385 (GCVE-0-2026-115385)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-26 19:38
VLAI
EPSS
VEX
Title
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Host Panic via WASIp3 Timestamps
Summary
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial of service vulnerability in the wasmtime-wasi WASIp3 implementation that allows guests to abort the Unix host process. Guests with mutable preopened directory access can call set-times or set-times-at with negative seconds timestamps before the epoch, triggering an assertion failure that crashes the host.
Severity
6.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 19:29 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-46.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
46.0.0 , < 48.0.4
(semver)
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Date Public
2026-10-02 00:00
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CVE-2026-115384 (GCVE-0-2026-115384)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Stack Buffer Overflow
Summary
Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a stack buffer overflow vulnerability that allows malicious guests to write ~16KB to the native stack via unvalidated async callback result types. Attackers can supply components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox.
Severity
9.9 (Critical)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-39.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
39.0.0 , < 48.0.4
(semver)
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Date Public
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CVE-2026-115383 (GCVE-0-2026-115383)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via Tag Imports
Summary
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Severity
4.8 (Medium)
CWE
- CWE-1287 - Improper Validation of Specified Type of Input
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-47.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
47.0.0 , < 48.0.4
(semver)
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Date Public
2026-10-02 00:00
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CVE-2026-115382 (GCVE-0-2026-115382)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-23 15:01
VLAI
EPSS
VEX
Title
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoS
Summary
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which is forwarded directly to a Tokio API that panics, crashing the host embedding.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 14:48 UTC
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-46.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
46.0.0 , < 48.0.4
(semver)
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Date Public
2026-10-02 00:00
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CVE-2026-115381 (GCVE-0-2026-115381)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-26 19:38
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Unbounded Host Memory Allocation via SinkOutputStream write-zeroes
Summary
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an unbounded memory allocation in the wasmtime-wasi WASIp2 write-zeroes method of SinkOutputStream, the default stream used when stdout/stderr are not configured. A malicious WebAssembly guest can request huge zero-filled writes, exhausting host memory and causing denial of service.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 19:27 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
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Date Public
2026-10-02 00:00
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CVE-2026-115380 (GCVE-0-2026-115380)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-26 19:38
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Fuel Limit Bypass DoS via WASI Preview 0 poll_oneoff
Summary
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains a denial of service vulnerability in the wasmtime-wasi WASI preview 0 poll_oneoff adapter, which performs O(n) host work per subscription without consuming or checking fuel. Malicious guest modules can pass many subscriptions to force long-running host computation that ignores configured fuel limits.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 19:27 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 36.0.17
(semver)
Unaffected: 36.0.17 (semver) Affected: 37.0.0 , < 48.0.4 (semver) Unaffected: 48.0.4 (semver) Affected: 49.0.0 , < 49.0.2 (semver) Unaffected: 49.0.2 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-10-02 00:00
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CVE-2026-115379 (GCVE-0-2026-115379)
Vulnerability from nvd – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via try_call
Summary
Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a missing GC rooting vulnerability that leaves references live across try_call unrooted when compiling Wasm modules. Attackers can supply Wasm modules whose callee triggers garbage collection, leaving stale or dangling references that cause GC heap corruption or incorrect execution.
Severity
5.7 (Medium)
CWE
- CWE-416 - Use After Free
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-47.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
47.0.0 , < 48.0.4
(semver)
Unaffected: 48.0.4 (semver) Affected: 49.0.0 , < 49.0.2 (semver) Unaffected: 49.0.2 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-10-02 00:00
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CVE-2026-115893 (GCVE-0-2026-115893)
Vulnerability from cvelistv5 – Published: 2026-10-23 21:29 – Updated: 2026-10-23 21:29
VLAI
EPSS
VEX
Title
Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction
Summary
Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4.
Severity
9.9 (Critical)
CWE
- CWE-691 - Insufficient Control Flow Management
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | x_refsource_CONFIRM |
| https://github.com/bytecodealliance/wasmtime/pull/14818 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14819 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14820 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14826 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
< 36.0.19
Affected: >= 37.0.0, < 48.0.7 Affected: >= 49.0.0, < 49.0.4 |
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},
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},
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CVE-2026-115892 (GCVE-0-2026-115892)
Vulnerability from cvelistv5 – Published: 2026-10-23 21:26 – Updated: 2026-10-23 21:26
VLAI
EPSS
VEX
Title
Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type
Summary
Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4.
Severity
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | x_refsource_CONFIRM |
| https://github.com/bytecodealliance/wasmtime/pull/14819 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14820 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14827 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
>= 46.0.0, < 48.0.7
Affected: >= 49.0.0, < 49.0.4 |
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CVE-2026-115889 (GCVE-0-2026-115889)
Vulnerability from cvelistv5 – Published: 2026-10-23 21:23 – Updated: 2026-10-26 17:42
VLAI
EPSS
VEX
Title
Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation
Summary
Wasmtime is a runtime for WebAssembly. Prior to 36.0.19 and 43.0.0, the Cranelift compiler backend bit-packs SSA value indices in a way that can silently overflow in release builds when compiling a sufficiently large or specially crafted Wasm function with many SSA values. The overflow can make Cranelift reference incorrect IR values, causing arbitrary miscompilation, type confusion, and other attacker-controlled effects that may escape the Wasm sandbox on any architecture using the default Cranelift backend. This issue is fixed in versions 36.0.19 and 43.0.0.
Severity
9.9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 15:40 UTC
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | x_refsource_CONFIRM |
| https://github.com/bytecodealliance/wasmtime/pull/12613 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/pull/14818 | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/comm… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
| https://github.com/bytecodealliance/wasmtime/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
< 36.0.19
Affected: >= 37.0.0, < 43.0.0 |
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CVE-2026-115393 (GCVE-0-2026-115393)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 Cross-Engine Type Confusion
Summary
Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixing objects between Engines via Instance::new, StructRefPre::new, or Tag::new can trigger trampoline signature mismatches causing out-of-bounds stack writes, GC heap corruption, or panics.
Severity
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 24.0.12
(semver)
Unaffected: 24.0.12 (semver) Affected: 25.0.0 , < 36.0.13 (semver) Unaffected: 36.0.13 (semver) Affected: 37.0.0 , < 46.0.2 (semver) Unaffected: 46.0.2 (semver) Affected: 47.0.0 , < 47.0.3 (semver) Unaffected: 47.0.3 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-07-31 00:00
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CVE-2026-115392 (GCVE-0-2026-115392)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 Sandbox Escape via Trailing Slashes
Summary
Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 allows a filesystem sandbox escape in wasmtime-wasi because its cap-std dependency mishandles symlinks with trailing slashes on macOS and Linux kernels lacking openat2. A guest with write access to any sandboxed directory can read and write any host-accessible file, and read-only guests may read host files via preexisting symlinks.
Severity
CWE
- CWE-61 - UNIX Symbolic Link (Symlink) Following
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 24.0.13
(semver)
Unaffected: 24.0.13 (semver) Affected: 25.0.0 , < 36.0.14 (semver) Unaffected: 36.0.14 (semver) Affected: 37.0.0 , < 46.0.3 (semver) Unaffected: 46.0.3 (semver) Affected: 47.0.0 , < 47.0.4 (semver) Unaffected: 47.0.4 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-08-20 00:00
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CVE-2026-115391 (GCVE-0-2026-115391)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbounded Heap Allocation via WASIp3 Streams
Summary
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.
Severity
5.8 (Medium)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-46.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
46.0.0 , < 46.0.3
(semver)
Unaffected: 46.0.3 (semver) Affected: 47.0.0 , < 47.0.4 (semver) Unaffected: 47.0.4 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-08-20 00:00
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CVE-2026-115390 (GCVE-0-2026-115390)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-23 15:00
VLAI
EPSS
VEX
Title
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS
Summary
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths. Malicious guests can reset consumed fuel after calls to run exponentially long on linear fuel, evading timeouts and periodic yields for denial of service.
Severity
5.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 14:48 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-47.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
47.0.0 , < 48.0.3
(semver)
Unaffected: 48.0.3 (semver) Affected: 49.0.0 , < 49.0.1 (semver) Unaffected: 49.0.1 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-09-24 00:00
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CVE-2026-115389 (GCVE-0-2026-115389)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Denial of Service via Val API
Summary
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 36.0.16
(semver)
Unaffected: 36.0.16 (semver) Affected: 37.0.0 , < 48.0.3 (semver) Unaffected: 48.0.3 (semver) Affected: 49.0.0 , < 49.0.1 (semver) Unaffected: 49.0.1 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-09-24 00:00
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CVE-2026-115388 (GCVE-0-2026-115388)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Memory Exhaustion DoS via wasmtime-wasi-http Outgoing Body Write
Summary
wasmtime-wasi-http in Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not enforce the wasi:io/streams check-write allowance for WASIp2 outgoing HTTP bodies, so oversized writes succeed instead of trapping. A malicious guest can pass large buffers to write on outgoing-body resources, holding host allocations for the store's lifetime and exhausting host memory.
Severity
6.2 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 36.0.16
(semver)
Unaffected: 36.0.16 (semver) Affected: 37.0.0 , < 48.0.3 (semver) Unaffected: 48.0.3 (semver) Affected: 49.0.0 , < 49.0.1 (semver) Unaffected: 49.0.1 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-09-24 00:00
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CVE-2026-115387 (GCVE-0-2026-115387)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Host Panic via WASI Filesystem Timestamp Overflow
Summary
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 contains a denial of service vulnerability in wasmtime-wasi that allows guest WASI programs to panic the host via overflowing filesystem timestamps. Attackers can pass atim or mtim values whose sub-second field overflows the seconds field to path_filestat_set_times, fd_filestat_set_times, set-times, or set-times-at, crashing the host.
Severity
6.2 (Medium)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 36.0.16
(semver)
Unaffected: 36.0.16 (semver) Affected: 37.0.0 , < 48.0.3 (semver) Unaffected: 48.0.3 (semver) Affected: 49.0.0 , < 49.0.1 (semver) Unaffected: 49.0.1 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-09-24 00:00
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CVE-2026-115386 (GCVE-0-2026-115386)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-23 15:00
VLAI
EPSS
VEX
Title
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure via fd_readdir
Summary
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fd_readdir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of leftover host stack or heap memory per directory entry.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 14:48 UTC
CWE
- CWE-908 - Use of Uninitialized Resource
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
0 , < 36.0.17
(semver)
Unaffected: 36.0.17 (semver) Affected: 37.0.0 , < 48.0.4 (semver) Unaffected: 48.0.4 (semver) Affected: 49.0.0 , < 49.0.2 (semver) Unaffected: 49.0.2 (semver) cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:* |
Date Public
2026-10-02 00:00
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CVE-2026-115385 (GCVE-0-2026-115385)
Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-26 19:38
VLAI
EPSS
VEX
Title
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Host Panic via WASIp3 Timestamps
Summary
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial of service vulnerability in the wasmtime-wasi WASIp3 implementation that allows guests to abort the Unix host process. Guests with mutable preopened directory access can call set-times or set-times-at with negative seconds timestamps before the epoch, triggering an assertion failure that crashes the host.
Severity
6.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 19:29 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bytecodealliance/wasmtime/secu… | vendor-advisory |
| https://www.vulncheck.com/advisories/wasmtime-46.… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bytecodealliance | wasmtime |
Affected:
46.0.0 , < 48.0.4
(semver)
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Date Public
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