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CVE-2026-34073— cryptography has incomplete DNS name constraint enforcement on peer names

Quick assessment

Affected
pyca cryptography
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

cryptography是Python Cryptographic Authority开源的一个Python的加密库。 cryptography 46.0.6之前版本存在信任管理问题漏洞，该漏洞源于DNS名称约束仅针对子证书中的SAN进行验证，而未验证每次验证期间呈现的对等名称，可能导致对等名称绕过通配符叶证书的排除子树约束。

AI Predicted 7.5 Difficulty: Easy EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1552.005 · Cloud Instance Metadata API
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I. Basic Information for CVE-2026-34073

Vulnerability Information
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Vulnerability Title
cryptography has incomplete DNS name constraint enforcement on peer names
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
cryptography 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cryptography是Python Cryptographic Authority开源的一个Python的加密库。 cryptography 46.0.6之前版本存在信任管理问题漏洞，该漏洞源于DNS名称约束仅针对子证书中的SAN进行验证，而未验证每次验证期间呈现的对等名称，可能导致对等名称绕过通配符叶证书的排除子树约束。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pyca cryptography < 46.0.6 -

II. Public POCs for CVE-2026-34073

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III. Intelligence Information for CVE-2026-34073

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IV. Related Vulnerabilities

Same product: cryptography
Same vendor: pyca
Same weakness: CWE-295

V. Comments for CVE-2026-34073

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