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VulnerabilityPublished Updated

CVE-2026-42011: gnutls · CWE-295

Affects gnutlsSource GCVE Database

0
Authoritative record:CVE-2026-42011· High 7.4

Not known to be exploited · CVSS 7.4 High : upgrade to 3.3.29 soon.

Data as of 26 Oct 2026, 12:55 UTC

CVSS 3.1 base score
7.4High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.3.29
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade the Red Hat gnutls package to 3.3.29.

Affected software

ProductAffectedFixed in
Red Hatgnutlspkg:rpm/gnutlsOther threatsAffected
  • <3.3.29 >=3.3.0
Fixed in
  • 3.3.29

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released an official security update fixing this vulnerability in GnuTLS version 3.3.29 for Red Hat Enterprise Linux 7 Extended Life Cycle Support. Users should apply this update promptly. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the official patch.

Description

CVE-2026-42011 is a vulnerability in the GnuTLS library where permitted name constraints were incorrectly ignored if previous Certificate Authorities only had excluded name constraints. This flaw allows a remote attacker to bypass critical name constraint checks during certificate validation, potentially leading to acceptance of invalid certificates. Such acceptance could enable spoofing or man-in-the-middle attacks. Red Hat has issued a security advisory with a fix for this vulnerability in their Extended Life Cycle Support 7 packages.

References

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