cryptography has incomplete DNS name constraint enforcement on peer names
At a glance
Severity
LOW 1.7
EPSS
EPSS 0.22 % · percentile 13 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
GitHub_M
NVD status
Modified
Description
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to version 46.0.6, DNS name constraints were only validated against SANs within child certificates, and not the "peer name" presented during each validation. Consequently, cryptography would allow a peer named bar.example.com to validate against a wildcard leaf certificate for *.example.com, even if the leaf's parent certificate (or upwards) contained an excluded subtree constraint for bar.example.com. This issue has been patched in version 46.0.6.
GHSA-m959-cc7f-wv43 — cryptography has incomplete DNS name constraint enforcement on peer names
PYSEC-2026-35 — cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to version 46.0.6, DNS name constraints were only
