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2 vulnerabilities by vouch
CVE-2026-55149 (GCVE-0-2026-55149)
Vulnerability from nvd – Published: 2026-09-15 16:30 – Updated: 2026-09-15 16:30
VLAI
EPSS
VEX
Title
Vouch Proxy: Unbounded Multipart Cookie Allocation DoS
Summary
Vouch Proxy is an SSO and OAuth/OIDC login solution for Nginx using the auth_request module. Prior to 0.48.0, Cookie in pkg/cookie/cookie.go parses the total part count from an attacker-controlled multipart cookie name and passes the value to make([]string, numParts) without checking that the value is positive or reasonably bounded. Requests to /validate and /_external-auth-:id reach JWTCacheHandler in pkg/jwtmanager/jwtcache.go, FindJWT in pkg/jwtmanager/jwtmanager.go, and the vulnerable cookie reassembly before JWT validation, so no account or valid session is required. A cookie name such as VouchCookie_1of10000000000 causes an attempted slice allocation of roughly 160 GB and a fatal Go runtime out-of-memory condition, allowing one request to crash the authentication proxy and repeated requests to sustain unavailability. This vulnerability is fixed in 0.48.0.
Severity
7.5 (High)
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/vouch/vouch-proxy/security/adv… | x_refsource_CONFIRM |
| https://github.com/vouch/vouch-proxy/commit/fa18c… | x_refsource_MISC |
| https://github.com/vouch/vouch-proxy/releases/tag… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| vouch | vouch-proxy |
Affected:
< 0.48.0
|
{
"containers": {
"cna": {
"affected": [
{
"product": "vouch-proxy",
"vendor": "vouch",
"versions": [
{
"status": "affected",
"version": "\u003c 0.48.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Vouch Proxy is an SSO and OAuth/OIDC login solution for Nginx using the auth_request module. Prior to 0.48.0, Cookie in pkg/cookie/cookie.go parses the total part count from an attacker-controlled multipart cookie name and passes the value to make([]string, numParts) without checking that the value is positive or reasonably bounded. Requests to /validate and /_external-auth-:id reach JWTCacheHandler in pkg/jwtmanager/jwtcache.go, FindJWT in pkg/jwtmanager/jwtmanager.go, and the vulnerable cookie reassembly before JWT validation, so no account or valid session is required. A cookie name such as VouchCookie_1of10000000000 causes an attempted slice allocation of roughly 160 GB and a fatal Go runtime out-of-memory condition, allowing one request to crash the authentication proxy and repeated requests to sustain unavailability. This vulnerability is fixed in 0.48.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-789",
"description": "CWE-789: Memory Allocation with Excessive Size Value",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T16:30:37.580Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68"
},
{
"name": "https://github.com/vouch/vouch-proxy/commit/fa18ce30ba50a4863a436acad044c22965329c4f",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/vouch/vouch-proxy/commit/fa18ce30ba50a4863a436acad044c22965329c4f"
},
{
"name": "https://github.com/vouch/vouch-proxy/releases/tag/v0.48.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/vouch/vouch-proxy/releases/tag/v0.48.0"
}
],
"source": {
"advisory": "GHSA-qqff-5854-px68",
"discovery": "UNKNOWN"
},
"title": "Vouch Proxy: Unbounded Multipart Cookie Allocation DoS"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55149",
"datePublished": "2026-09-15T16:30:37.580Z",
"dateReserved": "2026-06-16T15:13:28.164Z",
"dateUpdated": "2026-09-15T16:30:37.580Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-55149 (GCVE-0-2026-55149)
Vulnerability from cvelistv5 – Published: 2026-09-15 16:30 – Updated: 2026-09-15 16:30
VLAI
EPSS
VEX
Title
Vouch Proxy: Unbounded Multipart Cookie Allocation DoS
Summary
Vouch Proxy is an SSO and OAuth/OIDC login solution for Nginx using the auth_request module. Prior to 0.48.0, Cookie in pkg/cookie/cookie.go parses the total part count from an attacker-controlled multipart cookie name and passes the value to make([]string, numParts) without checking that the value is positive or reasonably bounded. Requests to /validate and /_external-auth-:id reach JWTCacheHandler in pkg/jwtmanager/jwtcache.go, FindJWT in pkg/jwtmanager/jwtmanager.go, and the vulnerable cookie reassembly before JWT validation, so no account or valid session is required. A cookie name such as VouchCookie_1of10000000000 causes an attempted slice allocation of roughly 160 GB and a fatal Go runtime out-of-memory condition, allowing one request to crash the authentication proxy and repeated requests to sustain unavailability. This vulnerability is fixed in 0.48.0.
Severity
7.5 (High)
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/vouch/vouch-proxy/security/adv… | x_refsource_CONFIRM |
| https://github.com/vouch/vouch-proxy/commit/fa18c… | x_refsource_MISC |
| https://github.com/vouch/vouch-proxy/releases/tag… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| vouch | vouch-proxy |
Affected:
< 0.48.0
|
{
"containers": {
"cna": {
"affected": [
{
"product": "vouch-proxy",
"vendor": "vouch",
"versions": [
{
"status": "affected",
"version": "\u003c 0.48.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Vouch Proxy is an SSO and OAuth/OIDC login solution for Nginx using the auth_request module. Prior to 0.48.0, Cookie in pkg/cookie/cookie.go parses the total part count from an attacker-controlled multipart cookie name and passes the value to make([]string, numParts) without checking that the value is positive or reasonably bounded. Requests to /validate and /_external-auth-:id reach JWTCacheHandler in pkg/jwtmanager/jwtcache.go, FindJWT in pkg/jwtmanager/jwtmanager.go, and the vulnerable cookie reassembly before JWT validation, so no account or valid session is required. A cookie name such as VouchCookie_1of10000000000 causes an attempted slice allocation of roughly 160 GB and a fatal Go runtime out-of-memory condition, allowing one request to crash the authentication proxy and repeated requests to sustain unavailability. This vulnerability is fixed in 0.48.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-789",
"description": "CWE-789: Memory Allocation with Excessive Size Value",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T16:30:37.580Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68"
},
{
"name": "https://github.com/vouch/vouch-proxy/commit/fa18ce30ba50a4863a436acad044c22965329c4f",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/vouch/vouch-proxy/commit/fa18ce30ba50a4863a436acad044c22965329c4f"
},
{
"name": "https://github.com/vouch/vouch-proxy/releases/tag/v0.48.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/vouch/vouch-proxy/releases/tag/v0.48.0"
}
],
"source": {
"advisory": "GHSA-qqff-5854-px68",
"discovery": "UNKNOWN"
},
"title": "Vouch Proxy: Unbounded Multipart Cookie Allocation DoS"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55149",
"datePublished": "2026-09-15T16:30:37.580Z",
"dateReserved": "2026-06-16T15:13:28.164Z",
"dateUpdated": "2026-09-15T16:30:37.580Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}