CVE-2026-65600 traefik CVE debrief

Who should care

Users of Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 should be aware of this authentication bypass vulnerability. Affected operators, platforms, vulnerability-management teams, and security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The ReplacePathRegex middleware in Traefik is vulnerable to authentication bypass via path traversal. When configured with a regex that captures user-controlled path segments without a mandatory path separator, an unauthenticated remote attacker can send a crafted request to bypass authentication middleware. This is because the middleware forwards the replaced path to the backend without validating that it matches its normalized form.

Defensive priority

High

Recommended defensive actions

• Inventory and verify Traefik versions
• Apply patches (v2.11.52, v3.6.23, and v3.7.7)
• Implement compensating controls
• Monitor for suspicious activity
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Evidence is based on limited source detail from CVE-2026-65600 CVE record and NVD entry. Further verification is required to confirm affected scope, severity, and vendor guidance. Defenders should verify Traefik versions, review compensating controls, and monitor for suspicious activity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.