SEPTEMBER 19, 2026
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Case File

CVE-2026-85597

CRITICAL · CVSS 9.1 EPSS 0.21% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-04 · Last synced 2026-09-19

CyberRota Analysis

AI-Generated

Traefik versions prior to 2.11.55 are vulnerable to a TLS option conflict resolution issue that permits unauthenticated attackers to bypass client-certificate authentication on multi-host routers. By exploiting this flaw, attackers can access protected backends, undermining the strict mutual TLS (mTLS) requirements. Organizations using Traefik for routing should prioritize patching to mitigate this high-severity vulnerability.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit
GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-85597
Severity
CRITICAL
CVSS
9.1
EPSS
0.21%

Original NVD Description

Traefik before v2.11.55 and v3.0.0 through v3.7.10 contain a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate authentication by creating conflicting TLS options on multi-host routers. Attackers can reach protected backends by exploiting shared TLS resolution across multiple hostnames in a single router rule, causing the strict mTLS requirement to fall back to default options for all hosts.

Related CVEs

Other vulnerabilities affecting the same vendor(s)