CVE-2026-32305
EUVD-2026-1366320.03.2026, 11:18
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.Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| traefik | traefik | 𝑥 < 2.11.41 |
| traefik | traefik | 3.0.0 ≤ 𝑥 ≤ 3.6.11 |
| traefik | traefik | 3.7.0:ea1 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 | 1776718585 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat OpenShift Dev Spaces 3.28 | 1779786779 ≤ 𝑥 < * | ADP |
Common Weakness Enumeration
- CWE-287 - Improper AuthenticationWhen an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
- CWE-179 - Incorrect Behavior Order: Early ValidationThe software validates input before applying protection mechanisms that modify the input, which could allow an attacker to bypass the validation via dangerous inputs that only arise after the modification.
References