Description
A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | gnutls | 3.8.1, 3.8.2, 3.8.3, 3.8.4, 3.8.5, 3.8.6, 3.8.7, 3.8.8, 3.8.9, 3.8.10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | RHEL-8 based Middleware Containers | — | — |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.18 | — | — |
| 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 | 3.8.11-3 | — |
| Debian 13 | gnutls28 | 3.8.9-3+deb13u1 | — |
| Debian 12 | gnutls28 | 3.7.9-2+deb12u6 | — |
| 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 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | 3.8.3-150600.4.12.1 | SUSE-SU-2025:4323-1 |
| SLES 15 SP6 | gnutls | 3.8.3-150600.4.12.1 | SUSE-SU-2025:4323-1 |
| SLES 12 SP5 | gnutls | 3.3.27-3.15.1 | SUSE-SU-2026:2367-1, SUSE-SU-2025:4346-1 |
Show 9 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_5.1 | SUSE-SU-2025:21222-1 |
| SLE Micro 6.0 | gnutls | 3.8.3-5.1 | SUSE-SU-2025:21202-1 |
| SLE Micro 5.5 | gnutls | 3.7.3-150400.4.53.1 | SUSE-SU-2025:4525-1 |
| SLE Micro 5.4 | gnutls | 3.7.3-150400.4.53.1 | SUSE-SU-2025:4525-1 |
| SLE Micro 5.3 | gnutls | 3.7.3-150400.19.1 | SUSE-SU-2025:4271-1 |
| SLE Micro 5.2 | gnutls | 3.6.7-150200.14.40.1 | SUSE-SU-2025:4272-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gnutls | 3.8.11-1.1 | openSUSE-SU-2025:15765-1 |
| openSUSE Leap 16.0 | gnutls | 3.8.10-160000.2.1 | openSUSE-SU-2026:20446-1 |
| openSUSE Leap 15.6 | gnutls | 3.8.3-150600.4.12.1 | SUSE-SU-2025:4323-1 |
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 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | gnutls | 3.8.3-8 | — |
| Azure Linux 2 (CBL-Mariner) | gnutls | 3.7.11-6 | — |
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 38
- 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-2026:7477 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:5585 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
- WID-SEC-2025-2651 GnuTLS: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Sep 3, 2026
- WID-SEC-2026-1730 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 16, 2026
- USN-8502-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Jul 6, 2026
- SUSE-SU-2026:2367-1 Security update for gnutls SUSE / openSUSE Security Updates · Jun 12, 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
- WID-SEC-2026-0778 Dell Secure Connect Gateway Policy Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 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
- ELSA-2026-5585 Moderate: gnutls security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 24, 2026
- openSUSE-SU-2025:15765-1 gnutls-3.8.11-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- RLSA-2026:4188 Moderate: gnutls security update Rocky Linux Security Advisories · Mar 23, 2026
- SUSE-SU-2025:4525-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21222-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21202-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4346-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 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
- 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
- SUSE-SU-2025:4272-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4271-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4323-1 Security update for gnutls SUSE / openSUSE Security Updates · Dec 9, 2025
References
- RHSA-2026:13812 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-2026:7329 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
- https://access.redhat.com/security/cve/CVE-2025-9820 vdb-entry
- RHBZ#2392528 issue-tracking
- https://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5
- https://gitlab.com/gnutls/gnutls/-/issues/1732
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18