Description
A flaw was found in GnuTLS. This vulnerability allows a denial of service (DoS) by excessive CPU (Central Processing Unit) and memory consumption via specially crafted malicious certificates containing a large number of name constraints and subject alternative names (SANs).
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 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 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | — |
| Red Hat | RHEL-8 based Middleware Containers | — | — |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.18 | — | — |
| Red Hat | Red Hat AI Inference Server 3.2 | — | — |
| Red Hat | Red Hat AI Inference Server 3.3 | — | — |
| Red Hat | Red Hat Ceph Storage 8 | — | — |
| Red Hat | Red Hat Discovery 2 | — | — |
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Insights proxy 1.5 | — | — |
| Red Hat | Red Hat Update Infrastructure 5 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
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 | 3.8.12-1 | — |
| Debian 13 | gnutls28 | 3.8.9-3+deb13u2 | DSA-6140-1 |
| Debian 12 | gnutls28 | 3.7.9-2+deb12u6 | DSA-6140-1 |
| Debian 11 | gnutls28 | 3.7.1-5+deb11u9 | DLA-4492-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | gnutls28 | 3.8.9-3ubuntu2.1 | USN-8043-1 |
| Ubuntu 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.5 | USN-8043-1 |
| Ubuntu 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.8 | USN-8043-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.5+Fips1.1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.8+Fips1.1 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | gnutls28 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | gnutls28 | 3.6.13-2ubuntu1.12+esm2 | USN-8502-1 |
| Ubuntu Pro 18.04 LTS | gnutls28 | 3.5.18-1ubuntu1.6+esm3 | USN-8502-1 |
| Ubuntu Pro 16.04 LTS | gnutls28 | 3.4.10-4ubuntu1.9+esm3 | USN-8502-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | gnutls +5 | 3.8.10-3.el10_1 | RHSA-2026:3477 |
| RHEL 9 | gnutls +4 | 3.8.3-10.el9_7 | RHSA-2026:4188 |
| RHEL 8 | gnutls +4 | 3.6.16-8.el8_10.5 | RHSA-2026:5585 |
Show 11 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_0.17 | RHSA-2026:6618 |
| RHEL 9.6 EUS | gnutls +4 | 3.8.3-6.el9_6.3 | RHSA-2026:6630 |
| RHEL 9.4 EUS | gnutls +4 | 3.8.3-4.el9_4.5 | RHSA-2026:6738 |
| RHEL 9.2 E4S | gnutls +4 | 3.7.6-21.el9_2.5 | RHSA-2026:6737 |
| 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 |
| Red Hat Hardened Images 1 | gnutls +7 | 3.8.12-1.1.hum1 | RHSA-2026:7477 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | gnutls +5 | 3.8.10-3.el10_1 | ALSA-2026:3477 |
| AlmaLinux 9 | gnutls +4 | 3.8.3-10.el9_7 | ALSA-2026:4188 |
| AlmaLinux 8 | gnutls +4 | 3.6.16-8.el8_10.5 | ALSA-2026:5585 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | gnutls | 3.8.10-3.el10_1 | RLSA-2026:3477 |
| Rocky Linux 9 | gnutls | 3.8.3-10.el9_7 | RLSA-2026:4188 |
| Rocky Linux 8 | gnutls | 3.6.16-8.el8_10.5 | RLSA-2026:5585 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | gnutls | 3.8.3-150600.4.17.1 | SUSE-SU-2026:0829-1 |
| SLES 12 SP5 | gnutls | 3.3.27-3.24.1 | SUSE-SU-2026:4953-1, SUSE-SU-2026:4943-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | gnutls | 3.8.10-160000.2.1 | SUSE-SU-2026:20984-1 |
| SLES 16.0 | gnutls | 3.8.10-160000.2.1 | SUSE-SU-2026:20984-1 |
| SLE Micro 6.2 | gnutls | 3.8.10-160000.2.1 | SUSE-SU-2026:20968-1, SUSE-SU-2026:20962-1 |
| SLE Micro 6.1 | gnutls | 3.8.3-slfo.1.1_6.1 | SUSE-SU-2026:20654-1 |
| SLE Micro 6.0 | gnutls | 3.8.3-6.1 | SUSE-SU-2026:20708-1 |
| SLE Micro 5.5 | gnutls | 3.7.3-150400.4.56.1 | SUSE-SU-2026:0862-1 |
| SLE Micro 5.4 | gnutls | 3.7.3-150400.4.56.1 | SUSE-SU-2026:0862-1 |
| 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 | 3.8.12-1.1 | openSUSE-SU-2026:10177-1 |
| openSUSE Leap 16.0 | gnutls | 3.8.10-160000.2.1 | openSUSE-SU-2026:20446-1 |
| openSUSE Leap 15.6 | gnutls | 3.8.3-150600.4.17.1 | SUSE-SU-2026:0829-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | gnutls | 3.8.12-r0 | — |
| Alpine v3.23 | gnutls | 3.8.12-r0 | — |
| Alpine v3.22 | gnutls | 3.8.12-r0 | — |
| Alpine v3.21 | gnutls | 3.8.12-r0 | — |
| Alpine v3.20 | gnutls | 3.8.12-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | gnutls +4 | 3.8.3-8.amzn2023.0.2 | ALAS2023-2026-1529 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | gnutls +5 | 3.8.10-3.el10_1 | ELSA-2026-3477 |
| Oracle Linux 9 | gnutls +4 | 3.8.3-10.el9_7 | ELSA-2026-50149, ELSA-2026-4188 |
| Oracle Linux 8 | gnutls +4 | 3.6.16-8.el8_10.5 | ELSA-2026-5585 |
Advisories 44
- SUSE-SU-2026:4953-1 Security update for gnutls SUSE / openSUSE Security Updates · Nov 2, 2026
- WID-SEC-2026-0359 GnuTLS: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 1, 2026
- SUSE-SU-2026:4943-1 Security update for gnutls SUSE / openSUSE Security Updates · Oct 31, 2026
- ALSA-2026:3477 Moderate: gnutls security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:4188 Moderate: gnutls security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:5585 Moderate: gnutls security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-1007 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2026
- RHSA-2026:33125 Red Hat Security Advisory: gnutls and libtasn1 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-2026:7477 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:6738 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:6737 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:6630 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:6618 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:5585 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:4188 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:3477 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-2253 IBM Security Verify Access: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- SUSE-SU-2026:2822-1 Security update for gnutls SUSE / openSUSE Security Updates · Jul 10, 2026
- USN-8502-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Jul 6, 2026
- ICSA-26-134-10 Siemens SIMATIC CISA ICS & IT advisories · May 14, 2026
- NCSC-2026-0147 Kwetsbaarheden verholpen in Siemens-producten NCSC-NL (Netherlands) · May 13, 2026
- SSA-032379 SSA-032379: Multiple Vulnerabilities in SIMATIC CN 4100 Before V5.0 Siemens ProductCERT · May 12, 2026
- USN-8043-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2026:20984-1 Security update for gnutls SUSE / openSUSE Security Updates · Apr 10, 2026
- SUSE-SU-2026:20968-1 Security update for gnutls SUSE / openSUSE Security Updates · Apr 9, 2026
- SUSE-SU-2026:20962-1 Security update for gnutls SUSE / openSUSE Security Updates · Apr 9, 2026
- RLSA-2026:5585 Moderate: gnutls security update Rocky Linux Security Advisories · Apr 7, 2026
- openSUSE-SU-2026:20446-1 Security update for gnutls SUSE / openSUSE Security Updates · Apr 3, 2026
- ALAS2023-2026-1529 Moderate: gnutls security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 1, 2026
- ELSA-2026-5585 Moderate: gnutls security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 24, 2026
- openSUSE-SU-2026:10177-1 gnutls-3.8.12-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20708-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20654-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- RLSA-2026:4188 Moderate: gnutls security update Rocky Linux Security Advisories · Mar 23, 2026
- SUSE-SU-2026:0862-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 13, 2026
- ELSA-2026-50149 Moderate: gnutls security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 12, 2026
- ELSA-2026-4188 Moderate: gnutls security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 11, 2026
- RLSA-2026:3477 Moderate: gnutls security update Rocky Linux Security Advisories · Mar 9, 2026
- SUSE-SU-2026:0829-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 6, 2026
- ELSA-2026-3477 Moderate: gnutls security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Mar 2, 2026
- DLA-4492-1 gnutls28 - security update Debian Security (DSA / DLA) · Feb 25, 2026
- DSA-6140-1 gnutls28 - security update Debian Security (DSA / DLA) · Feb 18, 2026
References
- RHSA-2026:13812 vendor-advisory
- RHSA-2026:16008 vendor-advisory
- RHSA-2026:16009 vendor-advisory
- RHSA-2026:16174 vendor-advisory
- RHSA-2026:25096 vendor-advisory
- RHSA-2026:30849 vendor-advisory
- RHSA-2026:30850 vendor-advisory
- RHSA-2026:33125 vendor-advisory
- RHSA-2026:3477 vendor-advisory
- RHSA-2026:4188 vendor-advisory
- RHSA-2026:4655 vendor-advisory
- RHSA-2026:4943 vendor-advisory
- RHSA-2026:5585 vendor-advisory
- RHSA-2026:5606 vendor-advisory
- RHSA-2026:6618 vendor-advisory
- RHSA-2026:6630 vendor-advisory
- RHSA-2026:6737 vendor-advisory
- RHSA-2026:6738 vendor-advisory
- RHSA-2026:7329 vendor-advisory
- RHSA-2026:7335 vendor-advisory
- RHSA-2026:7477 vendor-advisory
- RHSA-2026:82347 vendor-advisory
- RHSA-2026:82354 vendor-advisory
- RHSA-2026:82372 vendor-advisory
- RHSA-2026:82857 vendor-advisory
- RHSA-2026:8746 vendor-advisory
- RHSA-2026:8747 vendor-advisory
- RHSA-2026:8748 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2025-14831 vdb-entry
- RHBZ#2423177 issue-tracking
- https://gitlab.com/gnutls/gnutls/-/issues/1773