Bug 2549976 (CVE-2026-109379)

Summary: CVE-2026-109379 cockpit: Cockpit: User enumeration via timing discrepancy
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: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Cockpit. An observable timing discrepancy in the authentication mechanism allows an unauthenticated remote attacker to enumerate valid user accounts. By submitting login requests and measuring response times, an attacker can identify whether a username or email address exists based on differences in processing duration.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-12 21:05:32 UTC
Cockpit CMS 2.14.1 contains an observable timing discrepancy vulnerability that allows unauthenticated attackers to enumerate accounts due to an incomplete timing fix in /auth/check. Attackers can post login attempts and measure response times, since existing accounts incur two bcrypt operations versus one, revealing valid usernames and email addresses.