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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: 2026-09-17 16:08
    VLAI
    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)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-17 16:05 UTC
    CWE
    • CWE-789 - Memory Allocation with Excessive Size Value
    Assigner
    References
    Impacted products
    Vendor Product Version
    vouch vouch-proxy Affected: < 0.48.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-55149 (GCVE-0-2026-55149)

    Vulnerability from cvelistv5 – Published: 2026-09-15 16:30 – Updated: 2026-09-17 16:08
    VLAI
    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)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-17 16:05 UTC
    CWE
    • CWE-789 - Memory Allocation with Excessive Size Value
    Assigner
    References
    Impacted products
    Vendor Product Version
    vouch vouch-proxy Affected: < 0.48.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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