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[USN-7954-1] Libtasn1 vulnerabilities

Posted on 12 January 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7954-1
January 12, 2026

libtasn1-6 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Libtasn1 could be made to crash if it received specially crafted input.

Software Description:
- libtasn1-6: Library to manage ASN.1 structures

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 25.10
libtasn1-6 4.20.0-2ubuntu0.25.10.1

Ubuntu 25.04
libtasn1-6 4.20.0-2ubuntu0.25.04.1

Ubuntu 24.04 LTS
libtasn1-6 4.19.0-3ubuntu0.24.04.2

Ubuntu 22.04 LTS
libtasn1-6 4.18.0-4ubuntu0.2

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7954-1
CVE-2021-46848, CVE-2025-13151

Package Information:
https://launchpad.net/ubuntu/+source/libtasn1-6/4.20.0-2ubuntu0.25.10.1
https://launchpad.net/ubuntu/+source/libtasn1-6/4.20.0-2ubuntu0.25.04.1
https://launchpad.net/ubuntu/+source/libtasn1-6/4.19.0-3ubuntu0.24.04.2
https://launchpad.net/ubuntu/+source/libtasn1-6/4.18.0-4ubuntu0.2

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