CVE-2023-23931

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.

Score

CVSS 3.1 6.5 Medium

Status

Modified - security-advisories@github.com

Published

2023-02-07

Last modified

2025-11-03

Weaknesses

CWE-754

Affected products

• Cryptography (Cryptography.io)
• Cryptography (Pyca)

References

• https://github.com/pyca/cryptography/pull/8230/commits/94a50a9731f35405f0357fa5f3b177d46a726ab3
• https://github.com/pyca/cryptography/security/advisories/GHSA-w7pp-m8wf-vj6r
• https://lists.debian.org/debian-lts-announce/2024/10/msg00012.html
• https://security.netapp.com/advisory/ntap-20230324-0007/