Bug 2445763 (CVE-2026-3833) - CVE-2026-3833 gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison
Summary: CVE-2026-3833 gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstra...
Keywords:
Status: NEW
Alias: CVE-2026-3833
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-09 14:03 UTC by OSIDB Bzimport
Modified: 2026-04-30 17:28 UTC (History)
8 users (show)

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Description OSIDB Bzimport 2026-03-09 14:03:06 UTC 
gnutls compares nameConstraints labels using a case-sensitive memcmp path without an ascii-casefold canonicalization step. when excludedSubtrees/permittedSubtrees dNSName (dns) or rfc822Name (email) constraints are present, attacker-controlled casing differences in the leaf certificate SAN can cause a false accept (policy bypass) where the certificate should be rejected.
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