Description
Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GnuTLS | libtasn1 | ≤ 4.20.0 | — |
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 | 4.21.0-2 | — |
| Debian 13 | libtasn1-6 | 4.20.0-2+deb13u1 | — |
| Debian 12 | libtasn1-6 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | libtasn1-6 | 4.20.0-2ubuntu0.25.10.1 | USN-7954-1 |
| Ubuntu 24.04 LTS | libtasn1-6 | 4.19.0-3ubuntu0.24.04.2 | USN-7954-1 |
| Ubuntu 22.04 LTS | libtasn1-6 | 4.18.0-4ubuntu0.2 | USN-7954-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libtasn1-6 | 4.16.0-2ubuntu0.1+esm1 | — |
| Ubuntu Pro 18.04 LTS | libtasn1-6 | 4.13-2ubuntu0.1~esm1 | — |
| Ubuntu Pro 16.04 LTS | libtasn1-6 | 4.7-3ubuntu0.16.04.3+esm4 | — |
| Ubuntu Pro 14.04 LTS | libtasn1-6 | 3.4-3ubuntu0.6+esm1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libtasn1 +2 | 4.20.0-5.el10_2 | RHSA-2026:28235 |
| RHEL 9 | libtasn1 +2 | 4.16.0-10.el9_8 | RHSA-2026:28253 |
| RHEL 8 | libtasn1 +2 | 4.13-6.el8_10 | RHSA-2026:36728 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | libtasn1 +2 | 4.21.0-1.1.hum1 | RHSA-2026:7500 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libtasn1 +2 | 4.20.0-5.el10_2 | ALSA-2026:28235 |
| AlmaLinux 9 | libtasn1 +2 | 4.16.0-10.el9_8 | ALSA-2026:28253 |
| AlmaLinux 8 | libtasn1 +2 | 4.13-6.el8_10 | ALSA-2026:36728 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libtasn1 | 4.20.0-5.el10_2 | RLSA-2026:28235 |
| Rocky Linux 9 | libtasn1 | 4.16.0-10.el9_8 | RLSA-2026:28253 |
| Rocky Linux 8 | libtasn1 | 4.13-6.el8_10 | RLSA-2026:36728 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libtasn1 | 4.13-150000.4.14.1 | SUSE-SU-2026:0224-1 |
| SLES 12 SP5 | libtasn1 | 4.9-3.19.1 | SUSE-SU-2026:0118-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libtasn1 | 4.21.0-160000.1.1 | SUSE-SU-2026:21142-1 |
| SLES 16.0 | libtasn1 | 4.21.0-160000.1.1 | SUSE-SU-2026:21142-1 |
| SLE Micro 6.2 | libtasn1 | 4.21.0-160000.1.1 | SUSE-SU-2026:21001-1 |
| SLE Micro 6.1 | libtasn1 | 4.19.0-slfo.1.1_3.1 | SUSE-SU-2026:20355-1 |
| SLE Micro 6.0 | libtasn1 | 4.19.0-5.1 | SUSE-SU-2026:20051-1 |
| SLE Micro 5.5 | libtasn1 | 4.13-150000.4.14.1 | SUSE-SU-2026:0224-1 |
| SLE Micro 5.4 | libtasn1 | 4.13-150000.4.14.1 | SUSE-SU-2026:0224-1 |
| SLE Micro 5.3 | libtasn1 | 4.13-150000.4.14.1 | SUSE-SU-2026:0224-1 |
| SLE Micro 5.2 | libtasn1 | 4.13-150000.4.14.1 | SUSE-SU-2026:0224-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libtasn1 | 4.21.0-1.1 | openSUSE-SU-2026:10033-1 |
| openSUSE Leap 16.0 | libtasn1 | 4.21.0-160000.1.1 | openSUSE-SU-2026:20470-1 |
| openSUSE Leap 15.6 | libtasn1 | 4.13-150000.4.14.1 | SUSE-SU-2026:0224-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libtasn1 | 4.21.0-r0 | — |
| Alpine v3.23 | libtasn1 | 4.21.0-r0 | — |
| Alpine v3.22 | libtasn1 | 4.21.0-r0 | — |
| Alpine v3.21 | libtasn1 | 4.21.0-r0 | — |
| Alpine v3.20 | libtasn1 | 4.21.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libtasn1 +2 | 4.19.0-1.amzn2023.0.6 | ALAS2023-2026-1395 |
| Amazon Linux 2 | libtasn1 +2 | 4.10-1.amzn2.0.8 | ALAS2-2026-3143 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | gnutls | 3.8.3-8 | — |
| Azure Linux 3 | libtasn1 | 4.19.0-3 | — |
| Azure Linux 2 (CBL-Mariner) | gnutls | 3.7.11-6 | — |
| Azure Linux 2 (CBL-Mariner) | libtasn1 | 4.19.0-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libtasn1 +2 | 4.20.0-5.el10_2 | ELSA-2026-28235 |
| Oracle Linux 9 | libtasn1 +2 | 4.16.0-10.el9_8 | ELSA-2026-28253 |
| Oracle Linux 8 | libtasn1 +2 | 4.13-6.el8_10 | ELSA-2026-36728 |
Advisories 34
- WID-SEC-2026-4090 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2026:28253 Low: libtasn1 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:28235 Low: libtasn1 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:36728 Low: libtasn1 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2919 IBM App Connect Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- WID-SEC-2026-2437 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 22, 2026
- RHSA-2026:7500 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:36728 Red Hat Security Advisory: libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:28253 Red Hat Security Advisory: libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:28235 Red Hat Security Advisory: libtasn1 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-0044 libtasn1: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 14, 2026
- WID-SEC-2026-3043 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- NCSC-2026-0315 Kwetsbaarheden verholpen in Oracle MySQL NCSC-NL (Netherlands) · Aug 19, 2026
- NCSC-2026-0309 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Aug 19, 2026
- WID-SEC-2026-2887 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 18, 2026
- WID-SEC-2026-2903 Oracle MySQL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 18, 2026
- ELSA-2026-28235 Low: libtasn1 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- RLSA-2026:36728 Low: libtasn1 security update Rocky Linux Security Advisories · Jul 9, 2026
- ELSA-2026-36728 Low: libtasn1 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 8, 2026
- RLSA-2026:28235 Low: libtasn1 security update Rocky Linux Security Advisories · Jun 24, 2026
- RLSA-2026:28253 Low: libtasn1 security update Rocky Linux Security Advisories · Jun 24, 2026
- ELSA-2026-28253 Low: libtasn1 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- SUSE-SU-2026:21142-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Apr 22, 2026
- USN-7954-1 libtasn1-6 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- WID-SEC-2026-1194 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 21, 2026
- SUSE-SU-2026:21001-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Apr 14, 2026
- openSUSE-SU-2026:20470-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Apr 10, 2026
- openSUSE-SU-2026:10033-1 libtasn1-6-32bit-4.21.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20355-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20051-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0224-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Mar 23, 2026
- ALAS2-2026-3143 Important: libtasn1 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 5, 2026
- ALAS2023-2026-1395 Important: libtasn1 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 5, 2026
- SUSE-SU-2026:0118-1 Security update for libtasn1 SUSE / openSUSE Security Updates · Feb 4, 2026