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CVE-2026-54762 traefik CVE debrief

A medium-severity vulnerability was found in Traefik's Kubernetes Ingress NGINX provider from versions 3.7.0-ea.1 until 3.7.4. This issue causes affected routes to fail open when an Ingress explicitly enables BasicAuth or DigestAuth but the referenced auth Secret cannot be resolved or parsed. As a result, Traefik logs the resolution error, skips installing the authentication middleware, and still emits a router to the backend service. Consequently, a route that operators intended to protect is published to the data plane without its authentication control, allowing unauthenticated access to the backend. The vulnerability is fixed in version 3.7.5.

Vendor
traefik
Product
Unknown
CVSS
MEDIUM 5.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-23
Original CVE updated
2026-06-26
Advisory published
2026-06-23
Advisory updated
2026-06-26

Who should care

Operators and administrators using Traefik's Kubernetes Ingress NGINX provider from versions 3.7.0-ea.1 until 3.7.4 should be aware of this vulnerability. They should check their configurations and update to version 3.7.5 or later to mitigate the issue. This vulnerability may impact organizations that rely on Traefik for routing and authentication in their Kubernetes environments.

Technical summary

The vulnerability in Traefik's Kubernetes Ingress NGINX provider occurs when an Ingress enables BasicAuth or DigestAuth but the auth Secret is invalid or cannot be resolved. Traefik skips authentication middleware installation, leading to unauthenticated access to backend services. The issue arises from a missing, malformed, unreadable, or policy-denied Secret. This vulnerability has a CVSS score of 5.9 and is classified as medium severity.

Defensive priority

Medium priority should be given to updating Traefik to version 3.7.5. Operators should review their Ingress configurations to ensure that authentication is properly set up and that referenced Secrets are valid and resolvable.

Recommended defensive actions

  • Update Traefik to version 3.7.5 or later.
  • Review Ingress configurations for proper authentication setup.
  • Verify that referenced auth Secrets are valid and resolvable.
  • Monitor Traefik logs for resolution errors related to auth Secrets.
  • Implement compensating controls, such as additional authentication layers, if immediate update is not possible.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. The source item URL offers additional context from the NVD database. Vendor references include release notes and security advisories from GitHub.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54762 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54762

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-54762 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54762

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.