--- title: 'USN-8087-1: python-cryptography vulnerability | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-8087-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. 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](https://ubuntu.com/security/notices?release=questing) [24.04 LTS](https://ubuntu.com/security/notices?release=noble) [22.04 LTS](https://ubuntu.com/security/notices?release=jammy) --- Open side navigation ## Packages * [python-cryptography](https://ubuntu.com/security/cves?package=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. ## Update instructions In general, a standard system update will make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 25.10 questing | [python3-cryptography](https://launchpad.net/ubuntu/+source/python-cryptography) –  [43.0.0-1ubuntu1.1](https://launchpad.net/ubuntu/+source/python-cryptography/43.0.0-1ubuntu1.1) | | | | 24.04 LTS noble | [python3-cryptography](https://launchpad.net/ubuntu/+source/python-cryptography) –  [41.0.7-4ubuntu0.3](https://launchpad.net/ubuntu/+source/python-cryptography/41.0.7-4ubuntu0.3) | | | | 22.04 LTS jammy | [python3-cryptography](https://launchpad.net/ubuntu/+source/python-cryptography) –  [3.4.8-1ubuntu2.3](https://launchpad.net/ubuntu/+source/python-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](https://ubuntu.com/pro) ## References * [CVE-2026-26007](https://ubuntu.com/security/CVE-2026-26007) ## Related notices * [USN-8087-3](https://ubuntu.com/security/notices/USN-8087-3)