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Description

A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.

PUBLISHED Reserved 2026-04-23 | Published 2026-05-07 | Updated 2026-05-08 | Assigner redhat




HIGH: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem types

Improper Certificate Validation

Product status

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-05-06:Reported to Red Hat.
2026-04-29:Made public.

Credits

Red Hat would like to thank Haruto Kimura (Stella) for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-42011 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2467437 (RHBZ#2467437) issue-tracking

cve.org (CVE-2026-42011)

nvd.nist.gov (CVE-2026-42011)

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