Headline
GHSA-gv94-wp4h-vv8p: Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
A flaw was found in Keycloak. The Keycloak Authorization header parser is overly permissive regarding the formatting of the “Bearer” authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that deviate from RFC 6750 specifications.
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- GitHub Advisory Database
- GitHub Reviewed
- CVE-2026-0707
Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Moderate severity GitHub Reviewed Published Jan 8, 2026 to the GitHub Advisory Database • Updated Jan 8, 2026
Package
maven org.keycloak:keycloak-parent (Maven)
Affected versions
<= 26.5.0
Description
Published to the GitHub Advisory Database
Jan 8, 2026
EPSS score