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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-32305 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  GitHub, Inc.
CVSS-B 7.8 HIGH
Vector:  CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://access.redhat.com/errata/RHSA-2026:10175 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:21772 redhat-SADP
https://access.redhat.com/security/cve/CVE-2026-32305 redhat-SADP
https://bugzilla.redhat.com/show_bug.cgi?id=2449595 redhat-SADP
https://github.com/traefik/traefik/releases/tag/v2.11.41 GitHub, Inc. Release Notes 
https://github.com/traefik/traefik/releases/tag/v3.6.11 GitHub, Inc. Release Notes 
https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2 GitHub, Inc. Release Notes 
https://github.com/traefik/traefik/security/advisories/GHSA-wvvq-wgcr-9q48 GitHub, Inc. Patch  Vendor Advisory 
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32305.json redhat-SADP

Weakness Enumeration

CWE-ID CWE Name Source
CWE-179 Incorrect Behavior Order: Early Validation redhat-SADP  
CWE-287 Improper Authentication GitHub, Inc.  
CWE-1188 Insecure Default Initialization of Resource GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-32305
NVD Published Date:
03/20/2026
NVD Last Modified:
06/29/2026
Source:
GitHub, Inc.