CVSS 4.0
7.8 highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:NCVE-2026-32305
High (7.8) in traefik traefik. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/traefik/traefik/v3 3.6.11, 3.7.0-ea.2.
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.
Severity
CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-287, CWE-1188, CWE-179
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-wvvq-wgcr-9q48 | Go | github.com/traefik/traefik/v3 | >=3.7.0-ea.1 <3.7.0-ea.2 | 3.7.0-ea.2 |
| GHSA-wvvq-wgcr-9q48 | Go | github.com/traefik/traefik/v3 | <3.6.11 | 3.6.11 |
| GHSA-wvvq-wgcr-9q48 | Go | github.com/traefik/traefik/v2 | <2.11.41 | 2.11.41 |
| GHSA-wvvq-wgcr-9q48 | Go | github.com/traefik/traefik | <=1.7.34 | no fix published |
| GO-2026-4793 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-4793 | Go | github.com/traefik/traefik/v2 | <2.11.41 | 2.11.41 |
| GO-2026-4793 | Go | github.com/traefik/traefik/v3 | <3.6.11 >=3.7.0-ea.1 <3.7.0-ea.2 | 3.6.11, 3.7.0-ea.2 |