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Gnutls: gnutls: security bypass due to incorrect name constraint handling

CVSS 3.1 7.4 HIGHCheck source for fixed versionsKEV status unknown

Historical advisory recorded 5 Nov 2026 21:36:21 UTC. Read the latest advisory.

cve-program · CVE-2026-42011

Published

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.

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Affected versions, risk and source history

Related advisories and sources

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-42011 · CVE overview and exploitation status

cve-program · CVE-2026-42011

This historical advisory does not include today's related changes. Open the latest advisory to find current connections.

ChangeIntel

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Sources read 12 Nov 19:39 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current