Alerts This Week
Warning Icon 1 1,146
Alerts This Week
Warning Icon 1 1,146

Ubuntu 20.04 LTS Libtasn1 Important ASN.1 DoS Fix USN-7954-2

ubuntu
Calendar Grey February 11, 2026
Dist Ubuntu Esm H88
Multiple security issues were resolved in Libtasn1 for Ubuntu, affecting various releases with potential DoS risk.
Several security issues were fixed in Libtasn1.

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)

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important ASN.1 libtasn1

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7954-2

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important ASN.1 libtasn1

Package Information

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here