CVE-2026-32305 | Traefik up to 2.11.40/3.6.10 TLS Configuration improper authentication (GHSA-wvvq-wgcr-9q48)

VDB-352057 · CVE-2026-32305 · GHSA-WVVQ-WGCR-9Q48 TRAEFIK UP TO 2.11.40/3.6.10 TLS CONFIGURATION IMPROPER AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 2.27+ Summaryinfo A vulnerability classified as critical has been found in Traefik up to 2.11.40/3.6.10. This affects an unknown part of the component TLS Configuration Handler. This manipulation causes improper authentication. This vulnerability is tracked as CVE-2026-32305. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component. Detailsinfo A vulnerability has been found in Traefik up to 2.11.40/3.6.10 and classified as critical. Affected by this vulnerability is some unknown processing of the component TLS Configuration Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: 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. The advisory is shared at github.com. This vulnerability is known as CVE-2026-32305 since 03/11/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. Upgrading to version 2.11.41, 3.6.11 or 3.7.0-ea.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Productinfo Name Traefik Version 2.11.0 2.11.1 2.11.2 2.11.3 2.11.4 2.11.5 2.11.6 2.11.7 2.11.8 2.11.9 2.11.10 2.11.11 2.11.12 2.11.13 2.11.14 2.11.15 2.11.16 2.11.17 2.11.18 2.11.19 2.11.20 2.11.21 2.11.22 2.11.23 2.11.24 2.11.25 2.11.26 2.11.27 2.11.28 2.11.29 2.11.30 2.11.31 2.11.32 2.11.33 2.11.34 2.11.35 2.11.36 2.11.37 2.11.38 2.11.39 2.11.40 3.6.0 3.6.1 3.6.2 3.6.3 3.6.4 3.6.5 3.6.6 3.6.7 3.6.8 3.6.9 3.6.10 Website Product: https://github.com/traefik/traefik/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.0 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Improper authentication CWE: CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Traefik 2.11.41/3.6.11/3.7.0-ea.2 Timelineinfo 03/11/2026 CVE reserved 03/20/2026 +9 days Advisory disclosed 03/20/2026 +0 days VulDB entry created 03/20/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-wvvq-wgcr-9q48 Status: Confirmed CVE: CVE-2026-32305 (🔒) GCVE (CVE): GCVE-0-2026-32305 GCVE (VulDB): GCVE-100-352057 Entryinfo Created: 03/20/2026 13:28 Changes: 03/20/2026 13:28 (68) Complete: 🔍 Cache ID: 99:833:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸