Description
A flaw was found in GnuTLS, which relies on libtasn1 for ASN.1 data processing. Due to an inefficient algorithm in libtasn1, decoding certain DER-encoded certificate data can take excessive time, leading to increased resource consumption. This flaw allows a remote attacker to send a specially crafted certificate, causing GnuTLS to become unresponsive or slow, resulting in a denial-of-service condition.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | gnutls | ≤ 3.6.16, 3.7.0 – ≤ 3.7.11, 3.8.0 – < 3.8.8 | 3.8.8 |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| 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 Discovery 1.14 | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| 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 | 3.8.9-2 | — |
| Debian 13 | gnutls28 | 3.8.9-2 | — |
| Debian 12 | gnutls28 | 3.7.9-2+deb12u4 | DSA-5867-1 |
| Debian 11 | gnutls28 | 3.7.1-5+deb11u7 | DLA-4063-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.3 | USN-7281-1 |
| Ubuntu 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.6 | USN-7281-1 |
| Ubuntu 20.04 LTS | gnutls28 | 3.6.13-2ubuntu1.12 | USN-7281-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.4+Fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.6+Fips1 | — |
| 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 9 | gnutls +4 | 3.8.3-6.el9 | RHSA-2025:7076 |
| RHEL 8 | gnutls +4 | 3.6.16-8.el8_10.3 | RHSA-2025:4051 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | gnutls +4 | 3.8.3-4.el9_4.2 | RHSA-2025:8020 |
| RHEL 9.2 E4S | gnutls +4 | 3.7.6-21.el9_2.4 | RHSA-2025:17361 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | gnutls +4 | 3.8.3-6.el9 | ALSA-2025:7076 |
| AlmaLinux 8 | gnutls +4 | 3.6.16-8.el8_10.3 | ALSA-2025:4051 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | gnutls | 3.8.3-6.el9 | RLSA-2025:7076 |
| Rocky Linux 8 | gnutls | 3.6.16-8.el8_10.3 | RLSA-2025:4051 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | gnutls | 3.8.3-150600.4.6.2 | SUSE-SU-2025:00764-1 |
| SLES 15 SP6 | gnutls | 3.8.3-150600.4.6.2 | SUSE-SU-2025:0764-1 |
| SLES 12 SP5 | gnutls | 3.3.27-3.9.1 | SUSE-SU-2025:0767-1, SUSE-SU-2025:0766-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | gnutls | 3.8.3-slfo.1.1_2.1 | SUSE-SU-2025:20297-1 |
| SLE Micro 6.0 | gnutls | 3.8.3-3.1 | SUSE-SU-2025:20157-1 |
| SLE Micro 5.5 | gnutls | 3.7.3-150400.4.47.1 | SUSE-SU-2025:0765-1 |
| SLE Micro 5.4 | gnutls | 3.7.3-150400.4.47.1 | SUSE-SU-2025:0765-1 |
| SLE Micro 5.3 | gnutls | 3.7.3-150400.11.1 | SUSE-SU-2025:0728-1 |
| SLE Micro 5.2 | gnutls | 3.6.7-150200.14.34.1 | SUSE-SU-2025:0727-1 |
| SLE Micro 5.1 | gnutls | 3.6.7-150200.14.34.1 | SUSE-SU-2025:0727-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gnutls | 3.8.9-1.1 | openSUSE-SU-2025:14835-1 |
| openSUSE Leap 15.6 | gnutls | 3.8.3-150600.4.6.2 | SUSE-SU-2025:0764-1 |
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 | 3.8.3-6.amzn2023.0.1 | ALAS2023-2025-958 |
| Amazon Linux 2 | gnutls +4 | 3.3.29-9.amzn2.0.2 | ALAS2-2025-2885 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | gnutls | 3.8.3-4 | — |
| Azure Linux 2 (CBL-Mariner) | gnutls | 3.7.11-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | gnutls +4 | 3.8.3-6.el9 | ELSA-2025-7076 |
| Oracle Linux 8 | gnutls +4 | 3.6.16-8.el8_10.3 | ELSA-2025-20284, ELSA-2025-4051 |
Advisories 34
- ALSA-2025:7076 Moderate: gnutls security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4051 Moderate: gnutls security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:8020 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:7076 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:4051 Red Hat Security Advisory: gnutls security update Red Hat Security Advisories (RHSA) · Oct 14, 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-2025-1439 Dell Secure Connect Gateway: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2025-0302 GnuTLS: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 3, 2026
- USN-8502-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Jul 6, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- USN-7281-1 gnutls28 vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2025:20297-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:00764-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20157-1 Security update for gnutls SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5867-1 gnutls28 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4063-1 gnutls28 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:0767-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14835-1 gnutls-3.8.9-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0727-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0765-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0766-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0764-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0728-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2025-0382 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Dec 9, 2025
- SSA-202008 SSA-202008: Multiple Vulnerabilities in Ruggedcom Rox Before V2.17.0 Siemens ProductCERT · Dec 9, 2025
- RLSA-2025:7076 Moderate: gnutls security update Rocky Linux Security Advisories · Oct 7, 2025
- RLSA-2025:4051 Moderate: gnutls security update Rocky Linux Security Advisories · Jul 29, 2025
- ALAS2-2025-2885 Moderate: gnutls security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 12, 2025
- NCSC-2025-0187 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Jun 10, 2025
- ELSA-2025-7076 Moderate: gnutls security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 16, 2025
- ALAS2023-2025-958 Moderate: gnutls security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 13, 2025
- ELSA-2025-20284 Moderate: gnutls security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 24, 2025
- ELSA-2025-4051 Moderate: gnutls security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 21, 2025
References
- RHSA-2025:17361 vendor-advisory
- RHSA-2025:4051 vendor-advisory
- RHSA-2025:7076 vendor-advisory
- RHSA-2025:8020 vendor-advisory
- RHSA-2025:8385 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2024-12243 vdb-entry
- RHBZ#2344615 issue-tracking
- https://gitlab.com/gnutls/gnutls/-/issues/1553
- https://gitlab.com/gnutls/libtasn1/-/issues/52