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Ubuntu 25.10 python-cryptography High Information Exposure USN-8087-1

ubuntu
Calendar Grey March 12, 2026
Dist Ubuntu Esm H88
python-cryptography on Ubuntu exposes sensitive information over the network. Learn about the update for protection.
python-cryptography could be made to expose sensitive information over the network.

Summary

python-cryptography could be made to expose sensitive information over the

network.

Software Description:

- 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.

Topics%20covered

Topics Covered

security advisory Ubuntu high information exposure python-cryptography subgroup attack

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  python3-cryptography            43.0.0-1ubuntu1.1

Ubuntu 24.04 LTS
  python3-cryptography            41.0.7-4ubuntu0.3

Ubuntu 22.04 LTS
  python3-cryptography            3.4.8-1ubuntu2.3

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8087-1

CVE-2026-26007

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8087-1

Topics%20covered

Topics Covered

security advisory Ubuntu high information exposure python-cryptography subgroup attack

Package Information

https://launchpad.net/ubuntu/+source/python-cryptography/43.0.0-1ubuntu1.1
https://launchpad.net/ubuntu/+source/python-cryptography/41.0.7-4ubuntu0.3
https://launchpad.net/ubuntu/+source/python-cryptography/3.4.8-1ubuntu2.3

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