CVE-2026-85596

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Source
https://cve.org/CVERecord?id=CVE-2026-85596
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85596.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-85596
Aliases
  • GHSA-j994-9gqj-9hwq
Published
2026-09-04T11:30:00Z
Modified
2026-09-07T03:30:32Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Traefik v3.7 Authentication Bypass via TLS Option Conflict
Details

Traefik versions >= v3.7.0 and <= v3.7.10 contain an authentication bypass in the Kubernetes Ingress NGINX provider. The TLS option generated for an Ingress carrying the nginx.ingress.kubernetes.io/auth-tls-secret annotation was named after the Ingress namespace and name. As a result, two Ingress objects sharing the same host, the same client CA secret, and the same client-authentication mode produced two distinct TLS option names for that host. Traefik treats this as a TLS options conflict and falls back to the entry point's default TLS configuration, which does not request a client certificate, so a route configured with nginx.ingress.kubernetes.io/auth-tls-verify-client: "on" becomes reachable without a client certificate. Only the v3.7 line is affected; the issue is fixed in v3.7.11.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-287"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85596.json"
}
References

Affected packages

Git / github.com/traefik/traefik

Affected ranges

Type
GIT
Repo
https://github.com/traefik/traefik
Events
Introduced
04aa6bb4f9776f2ba87e5cd181d250e3610e6419
Last Affected
2a2349356c01b1b1f7ecddb0c17b30c97f5241e7
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "3.7.0"
        },
        {
            "last_affected": "3.7.10"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

v3.*
v3.7.0
v3.7.1
v3.7.10
v3.7.2
v3.7.3
v3.7.4
v3.7.5
v3.7.6
v3.7.7
v3.7.8
v3.7.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85596.json"