CVE-2026-41263Traefik is an HTTP reverse proxy and load balancer.
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No exploitation reported and no EPSS estimate yet.
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Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
- CVSS
- 3.7 LOW (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-208
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
traefik traefik traefik:traefik | before 2.11.43; from 3.0.0 before 3.6.14; 3.7.0; 3.7.0; 3.7.0; 3.7.0 | NVD |
References
- https://github.com/traefik/traefik/releases/tag/v2.11.43product, release-notes
- https://github.com/traefik/traefik/releases/tag/v3.6.14product, release-notes
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2product, release-notes
- https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2hpatch, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.