Ubuntu USN · USN-8087-3

python-cryptography vulnerability

Published: Tue, 28 Apr 2026 11:04

CVE-2026-26007

Summary

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

Details

USN-8087-1 fixed a vulnerability in python-cryptography. This update provides the corresponding update to Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. 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.

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu bionic

python-cryptography→2.1.4-1ubuntu1.4+esm3apt_upgrade
Standard apt upgrade. Install 2.1.4-1ubuntu1.4+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-cryptography→2.1.4-1ubuntu1.4+esm3apt_upgrade
Standard apt upgrade. Install 2.1.4-1ubuntu1.4+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-cryptography-doc→2.1.4-1ubuntu1.4+esm3apt_upgrade
Standard apt upgrade. Install 2.1.4-1ubuntu1.4+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography-doc
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-cryptography→2.1.4-1ubuntu1.4+esm3apt_upgrade
Standard apt upgrade. Install 2.1.4-1ubuntu1.4+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu focal

python-cryptography→2.8-3ubuntu0.3+esm2apt_upgrade
Standard apt upgrade. Install 2.8-3ubuntu0.3+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-cryptography→2.8-3ubuntu0.3+esm2apt_upgrade
Standard apt upgrade. Install 2.8-3ubuntu0.3+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-cryptography-doc→2.8-3ubuntu0.3+esm2apt_upgrade
Standard apt upgrade. Install 2.8-3ubuntu0.3+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography-doc
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-cryptography→2.8-3ubuntu0.3+esm2apt_upgrade
Standard apt upgrade. Install 2.8-3ubuntu0.3+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu xenial

python-cryptography→1.2.3-1ubuntu0.3+esm3apt_upgrade
Standard apt upgrade. Install 1.2.3-1ubuntu0.3+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-cryptography→1.2.3-1ubuntu0.3+esm3apt_upgrade
Standard apt upgrade. Install 1.2.3-1ubuntu0.3+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-cryptography-doc→1.2.3-1ubuntu0.3+esm3apt_upgrade
Standard apt upgrade. Install 1.2.3-1ubuntu0.3+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-cryptography-doc
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-cryptography→1.2.3-1ubuntu0.3+esm3apt_upgrade
Standard apt upgrade. Install 1.2.3-1ubuntu0.3+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-cryptography
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

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