CVE-2024-26130: Cryptography.io Cryptography

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Starting in version 38.0.0 and prior to version 42.0.4, if `pkcs12.serialize_key_and_certificates` is called with both a certificate whose public key did not match the provided private key and an `encryption_algorithm` with `hmac_hash` set (via `PrivateFormat.PKCS12.encryption_builder().hmac_hash(...)`, then a NULL pointer dereference would occur, crashing the Python process. This has been resolved in version 42.0.4, the first version in which a `ValueError` is properly raised.

Affected products

• Cryptography.io Cryptography: from 38.0.0, before 42.0.4 (fixed in 42.0.4)

Published 2024-02-21. Last modified 2026-06-17.