Description
A flaw in libtasn1 causes inefficient handling of specific certificate data. When processing a large number of elements in a certificate, libtasn1 takes much longer than expected, which can slow down or even crash the system. This flaw allows an attacker to send a specially crafted certificate, causing a denial of service attack.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libtasn1 | < 4.20.0 | 4.20.0 |
| 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 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 | libtasn1-6 | 4.20.0-1 | — |
| Debian 13 | libtasn1-6 | 4.20.0-1 | — |
| Debian 12 | libtasn1-6 | 4.19.0-2+deb12u1 | DSA-5863-1 |
| Debian 11 | libtasn1-6 | 4.16.0-2+deb11u2 | DLA-4061-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | libtasn1-6 | 4.19.0-3ubuntu0.24.04.1 | USN-7275-2 |
| Ubuntu 22.04 LTS | libtasn1-6 | 4.18.0-4ubuntu0.1 | USN-7275-1 |
| Ubuntu 20.04 LTS | libtasn1-6 | 4.16.0-2ubuntu0.1 | USN-7275-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | libtasn1-6 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libtasn1-6 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libtasn1-6 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | libtasn1 +2 | 4.16.0-9.el9 | RHSA-2025:7077 |
| RHEL 8 | libtasn1 +2 | 4.13-5.el8_10 | RHSA-2025:4049 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | libtasn1 +2 | 4.16.0-8.el9_4.1 | RHSA-2025:8021 |
| RHEL 9.2 E4S | libtasn1 +2 | 4.16.0-8.el9_2.1 | RHSA-2025:17347 |
| 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 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | libtasn1 +2 | 4.16.0-9.el9 | ALSA-2025:7077 |
| AlmaLinux 8 | libtasn1 +2 | 4.13-5.el8_10 | ALSA-2025:4049 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | libtasn1 | 4.16.0-9.el9 | RLSA-2025:7077 |
| Rocky Linux 8 | libtasn1 | 4.13-5.el8_10 | RLSA-2025:4049 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLES 15 SP5 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLES 15 SP4 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLES 15 SP3 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLES 12 SP5 | libtasn1 | 4.9-3.16.1 | SUSE-SU-2025:0512-1 |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLES for SAP 15 SP4 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLES for SAP 15 SP3 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLE Micro 6.1 | libtasn1 | 4.19.0-slfo.1.1_2.1 | SUSE-SU-2025:20275-1 |
| SLE Micro 6.0 | libtasn1 | 4.19.0-4.1 | SUSE-SU-2025:20171-1 |
| SLE Micro 5.5 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLE Micro 5.4 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLE Micro 5.3 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLE Micro 5.2 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLE Micro 5.1 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLE HPC 15 SP5 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLE HPC 15 SP4 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SLE HPC 15 SP3 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SUSE Manager Server 4.3 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SUSE Manager Proxy 4.3 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
| SUSE Enterprise Storage 7.1 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gnutls | 3.8.9-1.1 | openSUSE-SU-2025:14835-1 |
| openSUSE Tumbleweed | libtasn1 | 4.20.0-1.1 | openSUSE-SU-2025:14756-1 |
| openSUSE Leap 15.6 | libtasn1 | 4.13-150000.4.11.1 | SUSE-SU-2025:0548-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libtasn1 | 4.20.0-r0 | — |
| Alpine v3.23 | libtasn1 | 4.20.0-r0 | — |
| Alpine v3.22 | libtasn1 | 4.20.0-r0 | — |
| Alpine v3.21 | libtasn1 | 4.20.0-r0 | — |
| Alpine v3.20 | libtasn1 | 4.20.0-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libtasn1 | 4.20.0-r0 | — |
| Alpine v3.18 | libtasn1 | 4.20.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libtasn1 +2 | 4.19.0-1.amzn2023.0.5 | ALAS2023-2025-989 |
| Amazon Linux 2 | libtasn1 +2 | 4.10-1.amzn2.0.7 | ALAS2-2025-2886 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | gnutls | 3.8.3-4 | — |
| Azure Linux 3 | libtasn1 | 4.19.0-2 | — |
| Azure Linux 2 (CBL-Mariner) | gnutls | 3.7.11-2 | — |
| Azure Linux 2 (CBL-Mariner) | libtasn1 | 4.19.0-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libtasn1 +2 | 4.16.0-9.el9 | ELSA-2025-7077 |
| Oracle Linux 8 | libtasn1 +2 | 4.13-5.el8_10 | ELSA-2025-4049 |
Advisories 40
- ALSA-2025:7077 Moderate: libtasn1 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4049 Moderate: libtasn1 security update AlmaLinux Security Advisories · Oct 29, 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-2025:8021 Red Hat Security Advisory: libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:7077 Red Hat Security Advisory: libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:4049 Red Hat Security Advisory: libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:17347 Red Hat Security Advisory: libtasn1 security 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-2025-1559 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2025-0294 libtasn1: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jun 29, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- USN-7275-1 libtasn1-6 vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-7275-2 libtasn1-6 vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2025:20275-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20171-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5863-1 libtasn1-6 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4061-1 libtasn1-6 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2025:14835-1 gnutls-3.8.9-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0512-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14756-1 libtasn1-6-32bit-4.20.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0548-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-2363 Oracle MySQL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 3, 2026
- NCSC-2026-0022 Kwetsbaarheden verholpen in Oracle Communications producten NCSC-NL (Netherlands) · Jan 21, 2026
- WID-SEC-2026-0153 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 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
- WID-SEC-2025-2361 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 17, 2025
- WID-SEC-2025-2360 Oracle Communications Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 17, 2025
- NCSC-2025-0339 Kwetsbaarheden verholpen in Oracle MySQL NCSC-NL (Netherlands) · Oct 23, 2025
- NCSC-2025-0330 Kwetsbaarheden verholpen in Oracle Communications producten NCSC-NL (Netherlands) · Oct 23, 2025
- RLSA-2025:7077 Moderate: libtasn1 security update Rocky Linux Security Advisories · Oct 7, 2025
- RLSA-2025:4049 Moderate: libtasn1 security update Rocky Linux Security Advisories · Jul 29, 2025
- VDE-2025-053 Phoenix Contact: Multiple Vulnerabilities in PLCnext Firmware CERT@VDE · Jul 8, 2025
- ALAS2-2025-2886 Moderate: libtasn1 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
- ALAS2023-2025-989 Moderate: libtasn1 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 2, 2025
- ELSA-2025-7077 Moderate: libtasn1 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 16, 2025
- ELSA-2025-4049 Moderate: libtasn1 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 21, 2025
References
- RHSA-2025:17347 vendor-advisory
- RHSA-2025:4049 vendor-advisory
- RHSA-2025:7077 vendor-advisory
- RHSA-2025:8021 vendor-advisory
- RHSA-2025:8385 vendor-advisory
- RHSA-2026:30849 vendor-advisory
- RHSA-2026:30850 vendor-advisory
- RHSA-2026:33125 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2024-12133 vdb-entry
- RHBZ#2344611 issue-tracking
- https://gitlab.com/gnutls/libtasn1/-/blob/master/doc/security/CVE-2024-12133.md
- https://gitlab.com/gnutls/libtasn1/-/issues/52