CVE-2026-119574
Traefik 3.2.0 before 3.7.15 FastProxy Data Race Denial of Service
- State
- Published
- Severity
- 8.2 High
- Published
- Oct 30, 2026
- Updated
- Oct 30, 2026
- Reserved
- Oct 30, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.9 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-567 Unsynchronized Access to Shared Data in a Multithreaded Context
Affected Products
| Product | Versions |
|---|---|
traefiktraefik |
|
References
- GitHub Security Advisory (GHSA-ww7c-q3mv-xx22)vendor-advisory
- VulnCheck Advisory: Traefik 3.2.0 before 3.7.15 FastProxy Data Race Denial of Servicethird-party-advisory
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