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CVE-2025-66491
Traefik Inverted TLS Verification Logic in ingress-nginx Provider in github.com/traefik/traefik
Summary
Traefik Inverted TLS Verification Logic in ingress-nginx Provider in github.com/traefik/traefik
AI summary snake-internal / snake-template-v1
A weakness called CVE-2025-66491 was discovered in Traefik Inverted TLS.
Severity is Info. Low severity or not yet rated.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "Traefik Inverted TLS CVE-2025-66491".
CVE-2025-66491 (Traefik Inverted TLS). Severity: Info. Category: CWE-295.
Response plan:
1. Check the vendor advisory for affected versions and the patched release.
2. If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
3. If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
4. Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
❓ What is the problem
A weakness (CVE-2025-66491) in Traefik Inverted TLS. A serious software flaw has been identified.
📍 Affected scope
Target versions of Traefik Inverted TLS (see vendor advisory). If running in production, identify exposure immediately.
🔥 Severity
Severity: Info. Low severity or not yet rated.
🔧 How to fix
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-295)
🛡️ Workaround
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
🔍 Detection
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.
Affected packages
Go
github.com/traefik/traefik/v3
[{"type":"SEMVER","events":[{"introduced":"3.5.0"},{"fixed":"3.6.3"}]}]
Go
github.com/traefik/traefik
[{"type":"SEMVER","events":[{"introduced":"0"}]}]
Go
github.com/traefik/traefik/v2
[{"type":"SEMVER","events":[{"introduced":"0"}]}]
References
- advisory https://github.com/traefik/traefik/security/advisories/GHSA-7vww-mvcr-x6vj
- advisory https://nvd.nist.gov/vuln/detail/CVE-2025-66491
- package https://github.com/traefik/traefik
- patch https://github.com/traefik/traefik/commit/14a1aedf5704673d875d210d7bacf103a43c77e4
- web https://github.com/traefik/traefik/releases/tag/v3.6.3