CVE-2026-32305Traefik is an HTTP reverse proxy and load balancer.
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Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 are vulnerable to mTLS bypass through the TLS SNI pre-sniffing logic related to fragmented ClientHello packets. When a TLS ClientHello is fragmented across multiple records, Traefik's SNI extraction may fail with an EOF and return an empty SNI. The TCP router then falls back to the default TLS configuration, which does not require client certificates by default. This allows an attacker to bypass route-level mTLS enforcement and access services that should require mutual TLS authentication. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.
- CVSS
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-287, CWE-1188, CWE-179
- 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
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
traefik traefik traefik:traefik | before 2.11.41; from 3.0.0 through 3.6.11; 3.7.0 | NVD |
References
- https://github.com/traefik/traefik/releases/tag/v2.11.41release-notes
- https://github.com/traefik/traefik/releases/tag/v3.6.11release-notes
- https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2release-notes
- https://github.com/traefik/traefik/security/advisories/GHSA-wvvq-wgcr-9q48patch, vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:10175
- https://access.redhat.com/errata/RHSA-2026:21772
- https://access.redhat.com/security/cve/CVE-2026-32305
- https://bugzilla.redhat.com/show_bug.cgi?id=2449595
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32305.json
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.