========================================================================== Ubuntu Security Notice USN-7954-2 February 10, 2026
libtasn1-6 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in Libtasn1.
Software Description:
- libtasn1-6: Library to manage ASN.1 structures
Details:
USN-7954-1 fixed vulnerabilities in Libtasn1. This update provides the
corresponding updates for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu
18.04 LTS, and Ubuntu 20.04 LTS. CVE-2021-46848 only affected Ubuntu
14.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.
Original advisory details:
It was discovered that Libtasn1 incorrectly handled decoding ASN.1
content. An attacker could possibly use this issue to cause Libtasn1 to
crash, resulting in a denial of service. (CVE-2025-13151)
It was discovered that Libtasn1 incorrectly handled encoding ASN.1
content. An attacker could possibly use this issue to cause Libtasn1 to
crash, resulting in a denial of service. This issue only affected
Ubuntu 22.04 LTS. (CVE-2021-46848)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS
libtasn1-6 4.16.0-2ubuntu0.1+esm1
Available with Ubuntu Pro
Ubuntu 18.04 LTS
libtasn1-6 4.13-2ubuntu0.1~esm1
Available with Ubuntu Pro
Ubuntu 16.04 LTS
libtasn1-6 4.7-3ubuntu0.16.04.3+esm4
Available with Ubuntu Pro
Ubuntu 14.04 LTS
libtasn1-6 3.4-3ubuntu0.6+esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-7954-2
https://ubuntu.com/security/notices/USN-7954-1
CVE-2021-46848, CVE-2025-13151
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