Ubuntu Security Notices USN-8087-2 USN-8087-2: python-cryptography regression Publication date 16 March 2026 Overview USN-8087-1 introduced a regression in python-cryptography Releases 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages python-cryptography - Cryptography Python library Details USN-8087-1 fixed a vulnerability in python-cryptography. The update caused a regression when using ECC algorithms with certain software. This update fixes the problem. We apologize for the inconvenience. Original advisory details: It was discovered that python-cryptography incorrectly handled subgroup validation for SECT curves. A remote attacker could use this issue to perform a subgroup attack and possibly recover the least significant bits of private keys. USN-8087-1 fixed a vulnerability in python-cryptography. The update caused a regression when using ECC algorithms with certain software. This update fixes the problem. We apologize for the inconvenience. Original advisory details: It was discovered that python-cryptography incorrectly handled subgroup validation for SECT curves. A remote attacker could use this issue to perform a subgroup attack and possibly recover the least significant bits of private keys. 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-cryptography – 43.0.0-1ubuntu1.2 24.04 LTS noble python3-cryptography – 41.0.7-4ubuntu0.4 22.04 LTS jammy python3-cryptography – 3.4.8-1ubuntu2.4 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 https://launchpad.net/bugs/2144373