Description
A heap-buffer-overread vulnerability was found in GnuTLS in how it handles the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. This flaw allows a malicious user to create a certificate containing a malformed SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) that contains sensitive data. This issue leads to the exposure of confidential information when GnuTLS verifies certificates from certain websites when the certificate (SCT) is not checked correctly.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libgnutls | < 3.8.10 | 3.8.10 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| 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 Ceph Storage 7 | — | — |
| Red Hat | Red Hat Discovery 2 | — | — |
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Insights proxy 1.5 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| 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 | 3.8.9-3 | — |
| Debian 13 | gnutls28 | 3.8.9-3 | — |
| Debian 12 | gnutls28 | 3.7.9-2+deb12u5 | DSA-5962-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | gnutls28 | 3.8.9-3ubuntu1 | — |
| Ubuntu 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.4 | USN-7635-1 |
| Ubuntu 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.7 | USN-7635-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.4+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.7+Fips1 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | gnutls28 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | gnutls +5 | 3.8.9-9.el10_0.14 | RHSA-2025:16115 |
| RHEL 9 | gnutls +4 | 3.8.3-6.el9_6.2 | RHSA-2025:16116 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | gnutls +3 | 3.8.3-4.el9_4.4 | RHSA-2025:17348 |
| RHEL 9.2 E4S | gnutls +4 | 3.7.6-21.el9_2.4 | RHSA-2025:17361 |
| 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 | 3.8.9-9.el10_0.14 | ALSA-2025:16115 |
| AlmaLinux 9 | gnutls +4 | 3.8.3-6.el9_6.2 | ALSA-2025:16116 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | gnutls | 3.8.9-9.el10_0.14 | RLSA-2025:16115 |
| Rocky Linux 9 | gnutls | 3.8.3-6.el9_6.2 | RLSA-2025:16116 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | gnutls | 3.8.3-150600.4.9.1 | SUSE-SU-2025:02595-1 |
| SLES 15 SP6 | gnutls | 3.8.3-150600.4.9.1 | SUSE-SU-2025:02595-1 |
| SLES 15 SP5 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
| SLES 15 SP4 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
| SLES for SAP 15 SP4 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
| SLE Micro 6.1 | gnutls | 3.8.3-slfo.1.1_4.1 | SUSE-SU-2025:20665-1 |
| SLE Micro 6.0 | gnutls | 3.8.3-4.1 | SUSE-SU-2025:20563-1 |
| SLE Micro 5.5 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
| SLE Micro 5.4 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
| SLE Micro 5.3 | gnutls | 3.7.3-150400.14.1 | SUSE-SU-2025:02340-1 |
| SLE HPC 15 SP5 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
| SLE HPC 15 SP4 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
| SUSE Manager Server 4.3 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
| SUSE Manager Proxy 4.3 | gnutls | 3.7.3-150400.4.50.1 | SUSE-SU-2025:02589-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gnutls | 3.8.10-1.1 | openSUSE-SU-2025:15411-1 |
| openSUSE Leap 15.6 | gnutls | 3.8.3-150600.4.9.1 | SUSE-SU-2025:02595-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | gnutls | 3.8.11-r0 | — |
| Alpine v3.23 | gnutls | 3.8.11-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.amzn2023.0.1 | ALAS2023-2025-1140 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | gnutls | 3.8.3-6 | — |
| Azure Linux 2 (CBL-Mariner) | gnutls | 3.7.11-4 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | gnutls +5 | 3.8.9-9.el10_0.14 | ELSA-2025-16115 |
| Oracle Linux 9 | gnutls +4 | 3.8.3-6.el9_6.2 | ELSA-2025-20606, ELSA-2025-16116 |
Advisories 25
- ALSA-2025:16115 Moderate: gnutls security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:16116 Moderate: gnutls security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 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-2025:17361 Red Hat Security Advisory: gnutls security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- SSA-082556 SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-1526 GnuTLS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 3, 2026
- RHSA-2025:17348 Red Hat Security Advisory: gnutls security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 2, 2026
- RHSA-2025:16116 Red Hat Security Advisory: gnutls security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 2, 2026
- RHSA-2025:16115 Red Hat Security Advisory: gnutls security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 2, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- USN-7635-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:15411-1 gnutls-3.8.10-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02589-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02340-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20563-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20665-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02595-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5962-1 gnutls28 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2025:16116 Moderate: gnutls security, bug fix, and enhancement update Rocky Linux Security Advisories · Oct 10, 2025
- RLSA-2025:16115 Moderate: gnutls security, bug fix, and enhancement update Rocky Linux Security Advisories · Oct 3, 2025
- ELSA-2025-20606 Moderate: gnutls security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 19, 2025
- ELSA-2025-16115 Moderate: gnutls security, bug fix, and enhancement update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 19, 2025
- ELSA-2025-16116 Moderate: gnutls security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 18, 2025
- ALAS2023-2025-1140 Moderate: gnutls security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 18, 2025
- NCSC-2025-0246 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Aug 12, 2025
References
- RHSA-2025:16115 vendor-advisory
- RHSA-2025:16116 vendor-advisory
- RHSA-2025:17181 vendor-advisory
- RHSA-2025:17348 vendor-advisory
- RHSA-2025:17361 vendor-advisory
- RHSA-2025:19088 vendor-advisory
- RHSA-2025:22529 vendor-advisory
- RHSA-2026:7477 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2025-32989 vdb-entry
- RHBZ#2359621 issue-tracking
- https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html