# CVE-2026-34073: python-cryptography: cryptography is a package designed to expose cryptographic primitives and recipes to Python developers

CVE-2026-34073 is fixed in python-cryptography on 1 platform, first by DEBIAN-CVE-2026-34073, released March 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-34073
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 31, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-cryptography Debian 14 | 46.0.6-1 | [DEBIAN-CVE-2026-34073](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34073.md) | Mar 31, 2026 |
| Linux | python-cryptography opensuse-leap 16.0 | 44.0.3-160000.3.1 | [OPENSUSE-SU-2026:20506-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20506-1.md) | Apr 10, 2026 |
| Linux | python-cryptography sles 16.0 | 44.0.3-160000.3.1 | [SUSE-SU-2026:21165-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-21165-1.md) | Apr 10, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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