Description
A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differences. This vulnerability is a form of information disclosure.
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 9 | — | — |
| 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 | 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 Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| 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 | — |
Show 1 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 | — |
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 |
Show 4 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 |
| 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 |
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 |
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 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | gnutls | 3.8.13-1 | — |
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 |
Advisories 18
- 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
- WID-SEC-2026-3623 IBM DataPower Gateway: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- RHSA-2026:32962 Red Hat Security Advisory: gnutls 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-2026:20612 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
- ELSA-2026-20613 Important: gnutls security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 17, 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
- 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-2026:20612 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-2026:32962 vendor-advisory
- RHSA-2026:58981 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
- https://access.redhat.com/security/cve/CVE-2026-5419 vdb-entry
- RHBZ#2467686 issue-tracking
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-13