All vulnerabilities
CVE-2026-114641GHSA-mhjw-hmjv-p99x

Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper

traefik traefik
Open in ThreatlineRecord JSON
CVSS
6.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 16% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in2.11.58Also 3.7.14CVE List
Published22 Oct 2026Updated 22 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Traefik 2.11.x before 2.11.58 and 3.x before 3.7.14 contains a race condition in NTLM and Kerberos (Negotiate) backend authentication, where the per-connection sticky round tripper slot is read and written without synchronization. Remote attackers can send concurrent HTTP/2 or HTTP/3 requests over one connection to orphan backend connections, break connection-bound authentication, or crash Traefik.

Text from CVE List

Affected versions 4

  • traefikaffected: 2.11.0 before 2.11.58CVE List
  • traefikunaffected: 2.11.58CVE List
  • traefikaffected: 3.0.0 before 3.7.14CVE List
  • traefikunaffected: 3.7.14CVE List

References 2