Bug 2427768 (CVE-2026-0707)

Summary: CVE-2026-0707 keycloak: Keycloak Authorization Header Parsing Leading to Potential Security Control Bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aschwart, boliveir, mposolda, pjindal, rmartinc, ssilvert, sthorger, vmuzikar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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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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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-01-08 02:54:12 UTC
Keycloak’s authentication pipeline excessively tolerates non-standard Bearer token formats (case variations, Tab characters, multiple spaces, mixed whitespace) in the Authorization header, creating inconsistencies with front-end security controls (WAF/proxies) and enabling potential bypass risks.