Ubuntu Security Notices USN-8129-1 USN-8129-1: pyasn1 vulnerability Publication date 30 March 2026 Overview pyasn1 could be made to consume resources and crash if it received specially crafted input. Releases 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages pyasn1 - ASN.1 library for Python Details It was discovered that pyasn1 incorrectly handled recursion when decoding ASN.1 data. An attacker could use this issue to cause pyasn1 to consume resources, leading to a denial of service. It was discovered that pyasn1 incorrectly handled recursion when decoding ASN.1 data. An attacker could use this issue to cause pyasn1 to consume resources, leading to a denial of service. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 25.10 questing python3-pyasn1 – 0.6.1-1ubuntu0.2 24.04 LTS noble python3-pyasn1 – 0.4.8-4ubuntu0.2 22.04 LTS jammy python3-pyasn1 – 0.4.8-1ubuntu0.2 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-30922 CVE-2026-30922