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This PR contains the following updates:
46.0.5→46.0.6GitHub Vulnerability Alerts
CVE-2026-34073
Summary
In versions of cryptography prior to 46.0.5, 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.comto validate against a wildcard leaf certificate for*.example.com, even if the leaf's parent certificate (or upwards) contained an excluded subtree constraint forbar.example.com.This behavior resulted from a gap between RFC 5280 (which defines Name Constraint semantics) and RFC 9525 (which defines service identity semantics): put together, neither states definitively whether Name Constraints should be applied to peer names. To close this gap, cryptography now conservatively rejects any validation where the peer name would be rejected by a name constraint if it were a SAN instead.
In practice, exploitation of this bypass requires an uncommon X.509 topology, one that the Web PKI avoids because it exhibits these kinds of problems. Consequently, we consider this a medium-to-low impact severity.
See CVE-2025-61727 for a similar bypass in Go's
crypto/x509.Remediation
Users should upgrade to 46.0.6 or newer.
Attribution
Reporter: @1seal
Release Notes
pyca/cryptography (cryptography)
v46.0.6Compare Source
Configuration
📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
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