CVE-2026-119574

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    CVE-2026-119574

    Published: 30 Oct 2026Last Modified: 5 Nov 2026

    Summary: Traefik 3.2.0 before 3.7.15 FastProxy Data Race Denial of Service

    Details: Traefik from 3.2.0 before 3.7.15 contains a data race in the experimental FastProxy that allows unauthenticated attackers to crash the process by abusing HTTP/1 protocol upgrades. Attackers can repeatedly open and abort upgraded connections such as WebSocket, corrupting the unsynchronized shared bufio.Reader and triggering an unrecovered panic that terminates Traefik.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119574.json, https://github.com/traefik/traefik/security/advisories/GHSA-ww7c-q3mv-xx22, https://nvd.nist.gov/vuln/detail/CVE-2026-119574, https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.15-fastproxy-data-race-denial-of-service

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 25caa72c0972fcb829276ebf5a41ef0263fa4a6f
    Fixed -351a5ab1e884a6be95d02997016cbb2751106bc0

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-119574 | CVE-DB