Ubuntu Security Notices USN-8087-1 USN-8087-1: python-cryptography vulnerability Publication date 12 March 2026 Overview python-cryptography could be made to expose sensitive information over the network. 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 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. 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 – 43.0.0-1ubuntu1.1 24.04 LTS noble python3-cryptography – 41.0.7-4ubuntu0.3 22.04 LTS jammy python3-cryptography – 3.4.8-1ubuntu2.3 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-2026-26007 CVE-2026-26007