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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | gnutls | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.12 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.13 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.14 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.15 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.16 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.17 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.18 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.19 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.20 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.21 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4.22 | — | — |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.17 | — | — |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.18 | — | — |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.20 | — | — |
| Red Hat | Red Hat Discovery 2 | — | — |
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat OpenShift AI 3.4 | — | — |
| Red Hat | Red Hat Update Infrastructure 5 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gnutls28 | 3.8.13-1 | — |
| Debian 13 | gnutls28 | 3.8.9-3+deb13u4 | — |
| Debian 12 | gnutls28 | 3.7.9-2+deb12u7 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | gnutls28 | 3.8.12-2ubuntu1.1 | — |
| Ubuntu 25.10 | gnutls28 | 3.8.9-3ubuntu2.2 | — |
| Ubuntu 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.6 | — |
| Ubuntu 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.9 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.6+Fips1.2 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.9+Fips1 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | gnutls28 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | gnutls28 | 3.6.13-2ubuntu1.12+esm3 | USN-8539-1 |
| Ubuntu Pro 18.04 LTS | gnutls28 | 3.5.18-1ubuntu1.6+esm4 | USN-8539-1 |
| Ubuntu Pro 16.04 LTS | gnutls28 | 3.4.10-4ubuntu1.9+esm4 | USN-8539-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | gnutls +5 | 3.8.10-4.el10_2 | RHSA-2026:20613 |
| RHEL 9 | gnutls +4 | 3.8.10-4.el9_8 | RHSA-2026:20612 |
| RHEL 8 | gnutls +4 | 3.6.16-8.el8_10.6 | RHSA-2026:20611 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | gnutls +5 | 3.8.9-9.el10_0.19 | RHSA-2026:26409 |
| RHEL 9.6 EUS | gnutls +4 | 3.8.3-6.el9_6.4 | RHSA-2026:30004 |
| RHEL 9.4 E4S | gnutls +4 | 3.8.3-4.el9_4.6 | RHSA-2026:32962 |
| RHEL 9.2 E4S | gnutls +4 | 3.7.6-21.el9_2.7 | RHSA-2026:41921 |
| RHEL 8.8 TUS | gnutls +4 | 3.6.16-7.el8_8.4 | RHSA-2026:30850 |
| RHEL 8.8 TUS | libtasn1 +2 | 4.13-4.el8_8.1 | RHSA-2026:30850 |
| RHEL 8.8 E4S | gnutls +4 | 3.6.16-7.el8_8.4 | RHSA-2026:30850 |
| RHEL 8.8 E4S | libtasn1 +2 | 4.13-4.el8_8.1 | RHSA-2026:30850 |
| RHEL 8.6 EUS Long Life | gnutls +4 | 3.6.16-5.el8_6.5 | RHSA-2026:30849 |
| RHEL 8.6 EUS Long Life | libtasn1 +2 | 4.13-3.el8_6.2 | RHSA-2026:30849 |
| RHEL 8.6 AUS | gnutls +4 | 3.6.16-5.el8_6.5 | RHSA-2026:30849 |
| RHEL 8.6 AUS | libtasn1 +2 | 4.13-3.el8_6.2 | RHSA-2026:30849 |
| RHEL 8.4 EUS Long Life | gnutls +4 | 3.6.14-10.el8_4.1 | RHSA-2026:33125 |
| RHEL 8.4 EUS Long Life | libtasn1 +2 | 4.13-3.el8_4.1 | RHSA-2026:33125 |
| RHEL 8.4 AUS | gnutls +4 | 3.6.14-10.el8_4.1 | RHSA-2026:33125 |
| RHEL 8.4 AUS | libtasn1 +2 | 4.13-3.el8_4.1 | RHSA-2026:33125 |
| RHEL 7 ELS | gnutls +4 | 3.3.29-9.el7_9.2 | RHSA-2026:43575 |
| Red Hat Hardened Images 1 | gnutls +7 | 3.8.13-1.hum1 | RHSA-2026:13274 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | gnutls +5 | 3.8.10-4.el10_2 | ALSA-2026:20613 |
| AlmaLinux 9 | gnutls +4 | 3.8.10-4.el9_8 | ALSA-2026:20612 |
| AlmaLinux 8 | gnutls +4 | 3.6.16-8.el8_10.6 | ALSA-2026:20611 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | gnutls | 3.8.10-4.el10_2 | RLSA-2026:20613 |
| Rocky Linux 9 | gnutls | 3.8.10-4.el9_8 | RLSA-2026:20612 |
| Rocky Linux 8 | gnutls | 3.6.16-8.el8_10.6 | RLSA-2026:20611 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | gnutls | 3.3.27-3.21.1 | SUSE-SU-2026:2924-1, SUSE-SU-2026:2923-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.3 | gnutls | 3.7.3-150400.24.2 | SUSE-SU-2026:2822-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gnutls | 3.8.13-1.1 | openSUSE-SU-2026:10691-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | gnutls | 3.8.13-r0 | — |
| Alpine v3.23 | gnutls | 3.8.13-r0 | — |
| Alpine v3.22 | gnutls | 3.8.13-r0 | — |
| Alpine v3.21 | gnutls | 3.8.13-r0 | — |
| Alpine v3.20 | gnutls | 3.8.13-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | gnutls +4 | 3.8.10-4.amzn2023.0.2 | ALAS2023-2026-1808 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | gnutls +5 | 3.8.10-4.el10_2 | ELSA-2026-20613 |
| Oracle Linux 9 | gnutls +4 | 3.8.10-4.el9_8 | ELSA-2026-50346, ELSA-2026-20612 |
| Oracle Linux 8 | gnutls +4 | 3.6.16-8.el8_10.6 | ELSA-2026-20611 |
| Oracle Linux 7 | gnutls +4 | 3.3.29-9.0.3.el7_9 | ELSA-2026-43575 |
Advisories 33
- WID-SEC-2026-1312 GnuTLS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- ALSA-2026:20613 Important: gnutls security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:20612 Important: gnutls security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:20611 Important: gnutls security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-3623 IBM DataPower Gateway: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- RHSA-2026:41921 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:33125 Red Hat Security Advisory: gnutls and libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:32962 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:30850 Red Hat Security Advisory: gnutls and libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:30849 Red Hat Security Advisory: gnutls and libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:30004 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:26409 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:20613 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:20611 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:20612 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:13274 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- NCSC-2026-0431 Kwetsbaarheden verholpen in IBM DataPower Gateway en onderliggende componenten NCSC-NL (Netherlands) · Oct 16, 2026
- RHSA-2026:43575 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-3043 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- ELSA-2026-43575 Moderate: gnutls security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 11, 2026
- ELSA-2026-20613 Important: gnutls security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 17, 2026
- SUSE-SU-2026:2923-1 Security update for gnutls SUSE / openSUSE Security Updates · Jul 15, 2026
- SUSE-SU-2026:2924-1 Security update for gnutls SUSE / openSUSE Security Updates · Jul 15, 2026
- USN-8539-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Jul 14, 2026
- SUSE-SU-2026:2822-1 Security update for gnutls SUSE / openSUSE Security Updates · Jul 10, 2026
- ELSA-2026-50346 Important: gnutls security fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 24, 2026
- ELSA-2026-20612 Important: gnutls security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 24, 2026
- ALAS2023-2026-1808 Moderate: gnutls security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 8, 2026
- RLSA-2026:20613 Important: gnutls security update Rocky Linux Security Advisories · Jun 5, 2026
- RLSA-2026:20612 Important: gnutls security update Rocky Linux Security Advisories · Jun 2, 2026
- RLSA-2026:20611 Important: gnutls security update Rocky Linux Security Advisories · May 29, 2026
- ELSA-2026-20611 Important: gnutls security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 27, 2026
- openSUSE-SU-2026:10691-1 gnutls-3.8.13-1.1 on GA media SUSE / openSUSE Security Updates · May 6, 2026
References
- RHSA-2026:13274 vendor-advisory
- RHSA-2026:20611 vendor-advisory
- RHSA-2026:20612 vendor-advisory
- RHSA-2026:20613 vendor-advisory
- RHSA-2026:26319 vendor-advisory
- RHSA-2026:26409 vendor-advisory
- RHSA-2026:29197 vendor-advisory
- RHSA-2026:30004 vendor-advisory
- RHSA-2026:30849 vendor-advisory
- RHSA-2026:30850 vendor-advisory
- RHSA-2026:32962 vendor-advisory
- RHSA-2026:33125 vendor-advisory
- RHSA-2026:40762 vendor-advisory
- RHSA-2026:41921 vendor-advisory
- RHSA-2026:43575 vendor-advisory
- RHSA-2026:56853 vendor-advisory
- RHSA-2026:57483 vendor-advisory
- RHSA-2026:58981 vendor-advisory
- RHSA-2026:59831 vendor-advisory
- RHSA-2026:60019 vendor-advisory
- RHSA-2026:72502 vendor-advisory
- RHSA-2026:74674 vendor-advisory
- RHSA-2026:82304 vendor-advisory
- RHSA-2026:82322 vendor-advisory
- RHSA-2026:82347 vendor-advisory
- RHSA-2026:82354 vendor-advisory
- RHSA-2026:82372 vendor-advisory
- RHSA-2026:82857 vendor-advisory
- RHSA-2026:82888 vendor-advisory
- RHSA-2026:89197 vendor-advisory
- RHSA-2026:89232 vendor-advisory
- RHSA-2026:89333 vendor-advisory
- RHSA-2026:95508 vendor-advisory
- RHSA-2026:95745 vendor-advisory
- RHSA-2026:95755 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-42011 vdb-entry
- RHBZ#2467437 issue-tracking
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6