CVE-2023-49083: Cryptography.io Cryptography

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability. This vulnerability has been patched in version 41.0.6.

Affected products

• Cryptography.io Cryptography: from 3.1, before 41.0.6 (fixed in 41.0.6)

Published 2023-11-29. Last modified 2026-06-17.