Summary
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.
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | python-cryptography | 3.4.8-1ubuntu2.3 |
| Ubuntu · 24.04 LTS 24.04:LTS | python-cryptography | 41.0.7-4ubuntu0.3 |
| Ubuntu · 25.10 | python-cryptography | 43.0.0-1ubuntu1.1 |
Vulnerabilities 1
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High 8.2
cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 46.0.5, the public_key_from_numbers (or EllipticCurvePublicNumbers.public_key()), EllipticCurvePublicNumbers.public_key(), load_der_public_key() a…
References
-
report
https://ubuntu.com/security/CVE-2026-26007