CVE-2026-119574
mediumTraefik 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/…
Vendor / product: Traefik — traefik
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.
CVSS
5.9
5.9 (CVSS v3.1)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-10-30 14:16
Modified: 2026-11-03 14:04
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-03 14:20 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
traefik / traefik ≥3.2.0 <3.7.15
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://github.com/traefik/traefik/security/advisories/GHSA-ww7c-q3mv-xx22
References
- https://github.com/traefik/traefik/security/advisories/GHSA-ww7c-q3mv-xx22 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.15-fastproxy-data-race-denia... disclosure@vulncheck.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 14:20 UTC · record ↗