CVE-2026-59246 (GCVE-0-2026-59246)
Vulnerability from cvelistv5 – Published: 2026-07-14 08:37 – Updated: 2026-07-14 15:08
VLAI
EPSS
VEX
Title
Zero-length HTTP/2 CONTINUATION frames bypass Mint's header-block byte-size cap and exhaust client memory
Summary
Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.
The Mint.HTTP2.handle_continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper.
A malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.
This issue affects mint: from 0.1.0 before 1.9.2.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 12:25 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/elixir-mint/mint/security/advi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-59246.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-59246 | related |
| https://github.com/elixir-mint/mint/commit/5779de… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| elixir-mint | mint |
Affected:
0.1.0 , < 1.9.2
(semver)
cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:* |
||
| elixir-mint | mint |
Affected:
596ca4304504be68939c4929e0831557097962b8 , < 5779de1666344b32aefc4354184ea07f902f73ce
(git)
cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:* |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-59246",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-14T12:25:59.949476Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-14T12:26:05.211Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Mint.HTTP2\u0027"
],
"packageName": "mint",
"packageURL": "pkg:hex/mint",
"product": "mint",
"programFiles": [
"lib/mint/http2.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
},
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:assert_header_block_within_max_size/2"
}
],
"repo": "https://github.com/elixir-mint/mint",
"vendor": "elixir-mint",
"versions": [
{
"lessThan": "1.9.2",
"status": "affected",
"version": "0.1.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Mint.HTTP2\u0027"
],
"packageName": "elixir-mint/mint",
"packageURL": "pkg:github/elixir-mint/mint",
"product": "mint",
"programFiles": [
"lib/mint/http2.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
},
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:assert_header_block_within_max_size/2"
}
],
"repo": "https://github.com/elixir-mint/mint",
"vendor": "elixir-mint",
"versions": [
{
"lessThan": "5779de1666344b32aefc4354184ea07f902f73ce",
"status": "affected",
"version": "596ca4304504be68939c4929e0831557097962b8",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.9.2",
"versionStartIncluding": "0.1.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "zx (Jace)"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Andrea Leopardi"
},
{
"lang": "en",
"type": "remediation reviewer",
"value": "Eric Meadows-J\u00f6nsson"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAllocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.\u003c/p\u003e\u003cp\u003eThe \u003ctt\u003eMint.HTTP2.handle_continuation/3\u003c/tt\u003e function in \u003ctt\u003elib/mint/http2.ex\u003c/tt\u003e accumulates the header-block fragment carried by each HTTP/2 \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame into a growing \u003ctt\u003econn.headers_being_processed\u003c/tt\u003e nesting, one level deeper per frame, and only releases it when a frame with the \u003ctt\u003eEND_HEADERS\u003c/tt\u003e flag arrives. The only guard on this accumulator is \u003ctt\u003eMint.HTTP2.assert_header_block_within_max_size/2\u003c/tt\u003e, which sums the byte size of the fragments received so far. Because a \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames adds no bytes to the running total, never trips the size cap, and never emits \u003ctt\u003eEND_HEADERS\u003c/tt\u003e, yet each frame still nests the accumulator one level deeper.\u003c/p\u003e\u003cp\u003eA malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a \u003ctt\u003eHEADERS\u003c/tt\u003e frame without \u003ctt\u003eEND_HEADERS\u003c/tt\u003e and then stream zero-length \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.\u003c/p\u003e\u003cp\u003eThis issue affects mint: from 0.1.0 before 1.9.2.\u003c/p\u003e"
}
],
"value": "Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.\n\nThe Mint.HTTP2.handle_continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper.\n\nA malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.\n\nThis issue affects mint: from 0.1.0 before 1.9.2."
}
],
"impacts": [
{
"capecId": "CAPEC-130",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-130 Excessive Allocation"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-14T15:08:39.463Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-59246.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-59246"
},
{
"tags": [
"patch"
],
"url": "https://github.com/elixir-mint/mint/commit/5779de1666344b32aefc4354184ea07f902f73ce"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Zero-length HTTP/2 CONTINUATION frames bypass Mint\u0027s header-block byte-size cap and exhaust client memory",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-59246",
"datePublished": "2026-07-14T08:37:04.609Z",
"dateReserved": "2026-07-04T04:24:03.652Z",
"dateUpdated": "2026-07-14T15:08:39.463Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-59246",
"date": "2026-09-22",
"epss": "0.00502",
"percentile": "0.41958"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Mint.HTTP2\u0027"
],
"packageName": "mint",
"packageURL": "pkg:hex/mint",
"product": "mint",
"programFiles": [
"lib/mint/http2.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
},
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:assert_header_block_within_max_size/2"
}
],
"repo": "https://github.com/elixir-mint/mint",
"vendor": "elixir-mint",
"versions": [
{
"lessThan": "1.9.2",
"status": "affected",
"version": "0.1.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Mint.HTTP2\u0027"
],
"packageName": "elixir-mint/mint",
"packageURL": "pkg:github/elixir-mint/mint",
"product": "mint",
"programFiles": [
"lib/mint/http2.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
},
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:assert_header_block_within_max_size/2"
}
],
"repo": "https://github.com/elixir-mint/mint",
"vendor": "elixir-mint",
"versions": [
{
"lessThan": "5779de1666344b32aefc4354184ea07f902f73ce",
"status": "affected",
"version": "596ca4304504be68939c4929e0831557097962b8",
"versionType": "git"
}
]
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.\n\nThe Mint.HTTP2.handle_continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper.\n\nA malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.\n\nThis issue affects mint: from 0.1.0 before 1.9.2."
}
],
"id": "CVE-2026-59246",
"lastModified": "2026-07-15T20:17:21.813",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-59246",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-14T12:25:59.949476Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-14T09:16:41.727",
"references": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://cna.erlef.org/cves/CVE-2026-59246.html"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/elixir-mint/mint/commit/5779de1666344b32aefc4354184ea07f902f73ce"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-59246"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
}
],
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-59246",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-14T12:25:59.949476Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-14T12:24:16.265Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Mint.HTTP2\u0027"
],
"packageName": "mint",
"packageURL": "pkg:hex/mint",
"product": "mint",
"programFiles": [
"lib/mint/http2.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
},
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:assert_header_block_within_max_size/2"
}
],
"repo": "https://github.com/elixir-mint/mint",
"vendor": "elixir-mint",
"versions": [
{
"lessThan": "1.9.2",
"status": "affected",
"version": "0.1.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.Mint.HTTP2\u0027"
],
"packageName": "elixir-mint/mint",
"packageURL": "pkg:github/elixir-mint/mint",
"product": "mint",
"programFiles": [
"lib/mint/http2.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:handle_continuation/3"
},
{
"name": "\u0027Elixir.Mint.HTTP2\u0027:assert_header_block_within_max_size/2"
}
],
"repo": "https://github.com/elixir-mint/mint",
"vendor": "elixir-mint",
"versions": [
{
"lessThan": "5779de1666344b32aefc4354184ea07f902f73ce",
"status": "affected",
"version": "596ca4304504be68939c4929e0831557097962b8",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.9.2",
"versionStartIncluding": "0.1.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "zx (Jace)"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Andrea Leopardi"
},
{
"lang": "en",
"type": "remediation reviewer",
"value": "Eric Meadows-J\u00f6nsson"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAllocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.\u003c/p\u003e\u003cp\u003eThe \u003ctt\u003eMint.HTTP2.handle_continuation/3\u003c/tt\u003e function in \u003ctt\u003elib/mint/http2.ex\u003c/tt\u003e accumulates the header-block fragment carried by each HTTP/2 \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame into a growing \u003ctt\u003econn.headers_being_processed\u003c/tt\u003e nesting, one level deeper per frame, and only releases it when a frame with the \u003ctt\u003eEND_HEADERS\u003c/tt\u003e flag arrives. The only guard on this accumulator is \u003ctt\u003eMint.HTTP2.assert_header_block_within_max_size/2\u003c/tt\u003e, which sums the byte size of the fragments received so far. Because a \u003ctt\u003eCONTINUATION\u003c/tt\u003e frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames adds no bytes to the running total, never trips the size cap, and never emits \u003ctt\u003eEND_HEADERS\u003c/tt\u003e, yet each frame still nests the accumulator one level deeper.\u003c/p\u003e\u003cp\u003eA malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a \u003ctt\u003eHEADERS\u003c/tt\u003e frame without \u003ctt\u003eEND_HEADERS\u003c/tt\u003e and then stream zero-length \u003ctt\u003eCONTINUATION\u003c/tt\u003e frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.\u003c/p\u003e\u003cp\u003eThis issue affects mint: from 0.1.0 before 1.9.2.\u003c/p\u003e"
}
],
"value": "Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.\n\nThe Mint.HTTP2.handle_continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper.\n\nA malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.\n\nThis issue affects mint: from 0.1.0 before 1.9.2."
}
],
"impacts": [
{
"capecId": "CAPEC-130",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-130 Excessive Allocation"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-14T15:08:39.463Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-59246.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-59246"
},
{
"tags": [
"patch"
],
"url": "https://github.com/elixir-mint/mint/commit/5779de1666344b32aefc4354184ea07f902f73ce"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Zero-length HTTP/2 CONTINUATION frames bypass Mint\u0027s header-block byte-size cap and exhaust client memory",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-59246",
"datePublished": "2026-07-14T08:37:04.609Z",
"dateReserved": "2026-07-04T04:24:03.652Z",
"dateUpdated": "2026-07-14T15:08:39.463Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…