What is CVE-2026-34073?

CVE-2026-34073 is a medium-severity vulnerability in Cryptography.io Cryptography, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-03-31.

How severe is CVE-2026-34073?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Cryptography.io Cryptography

CVE-2026-34073

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" prese…

Vulnerability class: Improper Certificate Validation

EPSS: 0.002 (5.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Cryptography.io Cryptography
Pyca Cryptography — versions < 46.0.6

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34073?: CVE-2026-34073 is a medium-severity vulnerability in Cryptography.io Cryptography, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-03-31.
How severe is CVE-2026-34073?: Medium severity. CVSS v3 base score is 5.3 out of 10.