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Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth

Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth

CVE-2026-54763Published 2 weeks agoUpdated 1 week agoSource: OSV

Affected packages

  • github.com/traefik/traefik/v2
  • github.com/traefik/traefik/v3

Exploit signal

Known exploited (CISA KEV)
No
EPSS score
—
EPSS percentile
—

EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.

Sources

Structured record: https://osv.dev/vulnerability/GHSA-x677-9fxg-v5c5

Recommended response stack

Snyk — Scan your dependencies in CI and fix this vulnerability.→

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Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth | HackTribune