CVE-2026-42012
gnutls28: A flaw was found in gnutls
CVE-2026-42012 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
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0037
31st percentile
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| 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-2026-42012 | May 15, 2026 |
| gnutls28 · Debian 13.5 (trixie) | 3.8.9-3+deb13u4 | DEBIAN-CVE-2026-42012 | May 15, 2026 |
| gnutls28 · Debian 14 | 3.8.13-1 | DEBIAN-CVE-2026-42012 | 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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