CVE-2026-34073 — cryptography has incomplete DNS name constraint enforcement on peer names
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…
Published: 2026-03-31 · CVSS: 1.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7