CVE-2026-42011

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

CVE-2026-42011 is fixed in 21 products on 1 platform, first by RHSA-2026:26409, released May 4, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
8.2
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0048
41st percentile

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.

Where it's fixed

ProductFixed inFixReleased
Linux
gnutls · RHEL 10 3.8.9-9.el10_0.19 RHSA-2026:26409 May 4, 2026
gnutls · RHEL 8 0:3.6.16-8.el8_10.6 RHSA-2026:20611 May 27, 2026
gnutls · RHEL 9 0:3.8.10-4.el9_8 RHSA-2026:20612 Jun 24, 2026
gnutls · almalinux 10 3.8.10-4.el10_2 ALSA-2026:20613 May 26, 2026
gnutls · almalinux 8 3.6.16-8.el8_10.6 ALSA-2026:20611 May 26, 2026
gnutls · almalinux 9 3.8.10-4.el9_8 ALSA-2026:20612 May 26, 2026
gnutls · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls · ol 10 0:3.8.10-4.el10_2 ELSA-2026-20613 Jul 17, 2026
gnutls · ol 8 0:3.6.16-8.el8_10.6 ELSA-2026-20611 May 27, 2026
gnutls · ol 9 0:3.8.10-4.el9_8 ELSA-2026-20612 Jun 24, 2026
gnutls · rocky 10 0:3.8.10-4.el10_2 RLSA-2026:20613 Jun 5, 2026
gnutls · rocky 8 0:3.6.16-8.el8_10.6 RLSA-2026:20611 May 29, 2026
gnutls · rocky 9 0:3.8.10-4.el9_8 RLSA-2026:20612 Jun 2, 2026
gnutls-bin · Ubuntu 18.04.6 LTS (bionic) 3.5.18-1ubuntu1.6+esm4 gnutls-bin 3.5.18-1ubuntu1.6+esm4 May 7, 2026
gnutls-bin · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.12+esm3 gnutls-bin 3.6.13-2ubuntu1.12+esm3 May 7, 2026
gnutls-bin · Ubuntu 22.04.1 LTS (jammy) 3.7.3-4ubuntu1.9 gnutls-bin 3.7.3-4ubuntu1.9 May 27, 2026
gnutls-bin · Ubuntu 24.04.5 LTS (noble) 3.8.3-1.1ubuntu3.6 gnutls-bin 3.8.3-1.1ubuntu3.6 May 27, 2026
gnutls-bin · Ubuntu 25.10 (questing) 3.8.9-3ubuntu2.2 gnutls-bin 3.8.9-3ubuntu2.2 May 27, 2026
gnutls-bin · Ubuntu 26.04.1 LTS (resolute) 3.8.12-2ubuntu1.1 gnutls-bin 3.8.12-2ubuntu1.1 May 7, 2026
gnutls-c++ · RHEL 8 0:3.6.16-8.el8_10.6 RHSA-2026:20611 May 27, 2026
gnutls-c++ · RHEL 9 0:3.8.10-4.el9_8 RHSA-2026:20612 Jun 24, 2026
gnutls-c++ · almalinux 10 3.8.10-4.el10_2 ALSA-2026:20613 May 26, 2026
gnutls-c++ · almalinux 8 3.6.16-8.el8_10.6 ALSA-2026:20611 May 26, 2026
gnutls-c++ · almalinux 9 3.8.10-4.el9_8 ALSA-2026:20612 May 26, 2026
gnutls-c++ · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls-c++ · ol 10 0:3.8.10-4.el10_2 ELSA-2026-20613 Jul 17, 2026
gnutls-c++ · ol 8 0:3.6.16-8.el8_10.6 ELSA-2026-20611 May 27, 2026
gnutls-c++ · ol 9 0:3.8.10-4.el9_8 ELSA-2026-20612 Jun 24, 2026
gnutls-c++-debuginfo · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls-dane · RHEL 8 0:3.6.16-8.el8_10.6 RHSA-2026:20611 May 27, 2026
gnutls-dane · RHEL 9 0:3.8.10-4.el9_8 RHSA-2026:20612 Jun 24, 2026
gnutls-dane · almalinux 10 3.8.10-4.el10_2 ALSA-2026:20613 May 26, 2026
gnutls-dane · almalinux 8 3.6.16-8.el8_10.6 ALSA-2026:20611 May 26, 2026
gnutls-dane · almalinux 9 3.8.10-4.el9_8 ALSA-2026:20612 May 26, 2026
gnutls-dane · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls-dane · ol 10 0:3.8.10-4.el10_2 ELSA-2026-20613 Jul 17, 2026
gnutls-dane · ol 8 0:3.6.16-8.el8_10.6 ELSA-2026-20611 May 27, 2026
gnutls-dane · ol 9 0:3.8.10-4.el9_8 ELSA-2026-20612 Jun 24, 2026
gnutls-dane-debuginfo · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls-debuginfo · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls-debugsource · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls-devel · RHEL 8 0:3.6.16-8.el8_10.6 RHSA-2026:20611 May 27, 2026
gnutls-devel · RHEL 9 0:3.8.10-4.el9_8 RHSA-2026:20612 Jun 24, 2026
gnutls-devel · almalinux 10 3.8.10-4.el10_2 ALSA-2026:20613 May 26, 2026
gnutls-devel · almalinux 8 3.6.16-8.el8_10.6 ALSA-2026:20611 May 26, 2026
gnutls-devel · almalinux 9 3.8.10-4.el9_8 ALSA-2026:20612 May 26, 2026
gnutls-devel · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls-devel · ol 10 0:3.8.10-4.el10_2 ELSA-2026-20613 Jul 17, 2026
gnutls-devel · ol 8 0:3.6.16-8.el8_10.6 ELSA-2026-20611 May 27, 2026
gnutls-devel · ol 9 0:3.8.10-4.el9_8 ELSA-2026-20612 Jun 24, 2026
gnutls-fips · almalinux 10 3.8.10-4.el10_2 ALSA-2026:20613 May 26, 2026
gnutls-fips · ol 10 0:3.8.10-4.el10_2 ELSA-2026-20613 Jul 17, 2026
gnutls-utils · RHEL 8 0:3.6.16-8.el8_10.6 RHSA-2026:20611 May 27, 2026
gnutls-utils · RHEL 9 0:3.8.10-4.el9_8 RHSA-2026:20612 Jun 24, 2026
gnutls-utils · almalinux 10 3.8.10-4.el10_2 ALSA-2026:20613 May 26, 2026
gnutls-utils · almalinux 8 3.6.16-8.el8_10.6 ALSA-2026:20611 May 26, 2026
gnutls-utils · almalinux 9 3.8.10-4.el9_8 ALSA-2026:20612 May 26, 2026
gnutls-utils · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls-utils · ol 10 0:3.8.10-4.el10_2 ELSA-2026-20613 Jul 17, 2026
gnutls-utils · ol 8 0:3.6.16-8.el8_10.6 ELSA-2026-20611 May 27, 2026
gnutls-utils · ol 9 0:3.8.10-4.el9_8 ELSA-2026-20612 Jun 24, 2026
gnutls-utils-debuginfo · amzn 2023 3.8.10-4.amzn2023.0.2 ALAS2023-2026-1808 Jun 8, 2026
gnutls28 · Debian 12.15 (bookworm) 3.7.9-2+deb12u7 DEBIAN-CVE-2026-42011 May 15, 2026
gnutls28 · Debian 13.5 (trixie) 3.8.9-3+deb13u4 DEBIAN-CVE-2026-42011 May 15, 2026
gnutls28 · Debian 14 3.8.13-1 DEBIAN-CVE-2026-42011 May 15, 2026
guile-gnutls · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.12+esm3 guile-gnutls 3.6.13-2ubuntu1.12+esm3 May 7, 2026
guile-gnutls · Ubuntu 22.04.1 LTS (jammy) 3.7.3-4ubuntu1.9 guile-gnutls 3.7.3-4ubuntu1.9 May 27, 2026
libgnutls-dane0 · Ubuntu 18.04.6 LTS (bionic) 3.5.18-1ubuntu1.6+esm4 libgnutls-dane0 3.5.18-1ubuntu1.6+esm4 May 7, 2026
libgnutls-dane0 · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.12+esm3 libgnutls-dane0 3.6.13-2ubuntu1.12+esm3 May 7, 2026
libgnutls-dane0 · Ubuntu 22.04.1 LTS (jammy) 3.7.3-4ubuntu1.9 libgnutls-dane0 3.7.3-4ubuntu1.9 May 27, 2026
libgnutls-dane0t64 · Ubuntu 24.04.5 LTS (noble) 3.8.3-1.1ubuntu3.6 libgnutls-dane0t64 3.8.3-1.1ubuntu3.6 May 27, 2026
libgnutls-dane0t64 · Ubuntu 25.10 (questing) 3.8.9-3ubuntu2.2 libgnutls-dane0t64 3.8.9-3ubuntu2.2 May 27, 2026
libgnutls-dane0t64 · Ubuntu 26.04.1 LTS (resolute) 3.8.12-2ubuntu1.1 libgnutls-dane0t64 3.8.12-2ubuntu1.1 May 7, 2026
libgnutls-openssl27 · Ubuntu 18.04.6 LTS (bionic) 3.5.18-1ubuntu1.6+esm4 libgnutls-openssl27 3.5.18-1ubuntu1.6+esm4 May 7, 2026
libgnutls-openssl27 · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.12+esm3 libgnutls-openssl27 3.6.13-2ubuntu1.12+esm3 May 7, 2026
libgnutls-openssl27 · Ubuntu 22.04.1 LTS (jammy) 3.7.3-4ubuntu1.9 libgnutls-openssl27 3.7.3-4ubuntu1.9 May 27, 2026
libgnutls-openssl27t64 · Ubuntu 24.04.5 LTS (noble) 3.8.3-1.1ubuntu3.6 libgnutls-openssl27t64 3.8.3-1.1ubuntu3.6 May 27, 2026
libgnutls-openssl27t64 · Ubuntu 25.10 (questing) 3.8.9-3ubuntu2.2 libgnutls-openssl27t64 3.8.9-3ubuntu2.2 May 27, 2026
libgnutls-openssl27t64 · Ubuntu 26.04.1 LTS (resolute) 3.8.12-2ubuntu1.1 libgnutls-openssl27t64 3.8.12-2ubuntu1.1 May 7, 2026
libgnutls30 · Ubuntu 18.04.6 LTS (bionic) 3.5.18-1ubuntu1.6+esm4 libgnutls30 3.5.18-1ubuntu1.6+esm4 May 7, 2026
libgnutls30 · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.12+esm3 libgnutls30 3.6.13-2ubuntu1.12+esm3 May 7, 2026
libgnutls30 · Ubuntu 22.04.1 LTS (jammy) 3.7.3-4ubuntu1.9 libgnutls30 3.7.3-4ubuntu1.9 May 27, 2026
libgnutls30t64 · Ubuntu 24.04.5 LTS (noble) 3.8.3-1.1ubuntu3.6 libgnutls30t64 3.8.3-1.1ubuntu3.6 May 27, 2026
libgnutls30t64 · Ubuntu 25.10 (questing) 3.8.9-3ubuntu2.2 libgnutls30t64 3.8.9-3ubuntu2.2 May 27, 2026
libgnutls30t64 · Ubuntu 26.04.1 LTS (resolute) 3.8.12-2ubuntu1.1 libgnutls30t64 3.8.12-2ubuntu1.1 May 7, 2026
libgnutlsxx28 · Ubuntu 18.04.6 LTS (bionic) 3.5.18-1ubuntu1.6+esm4 libgnutlsxx28 3.5.18-1ubuntu1.6+esm4 May 7, 2026
libgnutlsxx28 · Ubuntu 20.04 LTS (focal) 3.6.13-2ubuntu1.12+esm3 libgnutlsxx28 3.6.13-2ubuntu1.12+esm3 May 7, 2026
libgnutlsxx28 · Ubuntu 22.04.1 LTS (jammy) 3.7.3-4ubuntu1.9 libgnutlsxx28 3.7.3-4ubuntu1.9 May 27, 2026

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