VULNERABILITY INTELLIGENCE

CVE-2026-34073

CVSS score5.3 MEDIUM
EPSS probability0.23%
CISA KEVNot currently listed
Published2026-03-31
Last modified2026-10-14
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-295

Primary references