Description
The _asn1_check_identifier function in GNU Libtasn1 through 4.12 causes a NULL pointer dereference and crash when reading crafted input that triggers assignment of a NULL value within an asn1_node structure. It may lead to a remote denial of service attack.
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 | 4.12-2.1 | — |
| Debian 13 | libtasn1-6 | 4.12-2.1 | — |
| Debian 12 | libtasn1-6 | 4.12-2.1 | — |
| Debian 9 | libtasn1-6 | 4.10-1.1+deb9u1 | DSA-4106-1 |
| Debian 8 | libtasn1-6 | 4.2-3+deb8u4 | DLA-2255-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | libtasn1-3 | 2.13-2+deb7u5 | DLA-1038-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | libtasn1-6 | 4.7-3ubuntu0.16.04.3 | USN-3547-1 |
| Ubuntu 14.04 LTS | libtasn1-6 | 3.4-3ubuntu0.6 | USN-3547-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | gnutls | 3.6.2-6.3.1 | SUSE-SU-2018:2930-1 |
| SLES 12 SP3 | gnutls | 3.3.27-3.3.1 | SUSE-SU-2018:2842-1 |
| SLES 12 SP2 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-2, SUSE-SU-2018:2825-1 |
| SLES 12 SP1 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
| SLES 12 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | gnutls | 2.4.1-24.39.76.1 | SUSE-SU-2019:14058-1 |
| SLES for SAP 12 SP3 | gnutls | 3.3.27-3.3.1 | SUSE-SU-2018:2842-1 |
| SLES for SAP 12 SP2 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
| SLES for SAP 12 SP1 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
| SUSE OpenStack Cloud 7 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
| SUSE Enterprise Storage 4 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libtasn1 | 4.12-r1 | — |
| Alpine v3.23 | libtasn1 | 4.12-r1 | — |
| Alpine v3.22 | libtasn1 | 4.12-r1 | — |
| Alpine v3.21 | libtasn1 | 4.12-r1 | — |
| Alpine v3.20 | libtasn1 | 4.12-r1 | — |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libtasn1 | 4.12-r1 | — |
| Alpine v3.18 | libtasn1 | 4.12-r1 | — |
| Alpine v3.17 | libtasn1 | 4.12-r1 | — |
| Alpine v3.16 | libtasn1 | 4.12-r1 | — |
| Alpine v3.15 | libtasn1 | 4.12-r1 | — |
| Alpine v3.14 | libtasn1 | 4.12-r1 | — |
| Alpine v3.13 | libtasn1 | 4.12-r1 | — |
| Alpine v3.12 | libtasn1 | 4.12-r1 | — |
| Alpine v3.11 | libtasn1 | 4.12-r1 | — |
| Alpine v3.10 | libtasn1 | 4.12-r1 | — |
| Alpine v3.9 | libtasn1 | 4.12-r1 | — |
| Alpine v3.8 | libtasn1 | 4.12-r1 | — |
| Alpine v3.7 | libtasn1 | 4.12-r1 | — |
| Alpine v3.6 | libtasn1 | 4.10-r2 | — |
| Alpine v3.5 | libtasn1 | 4.9-r2 | — |
| Alpine v3.4 | libtasn1 | 4.8-r2 | — |
| Alpine v3.3 | libtasn1 | 4.7-r3 | — |
Advisories 10
- WID-SEC-2026-3116 libtasn1: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Aug 31, 2026
- USN-3547-1 libtasn1-6 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4106-1 libtasn1-6 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2255-1 libtasn1-6 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1038-1 libtasn1-3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:2825-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14058-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2825-2 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2842-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2930-1 Security update for gnutls SUSE / openSUSE Security Updates · May 2, 2025
References
- GLSA-201710-11 vendor-advisory
- USN-3547-1 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1464141
- DSA-4106 vendor-advisory
- [debian-lts-announce] 20200628 [SECURITY] [DLA 2255-1] libtasn1-6 security update mailing-list
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list