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CVE-2026-69248— python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees

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.

Python Cryptographic Authority cryptography是Python Cryptographic Authority组织开源的一款密码学工具库。 Python Cryptographic Authority cryptography 49.0.0之前版本存在加密问题漏洞，该漏洞源于DNSConstraint::matches中通配符模式被错误地视为匹配更具体的允许约束，可能导致接受无效证书链。

CVSS 6.9 · Medium EPSS 0.31% · P21

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
pyca cryptography < 49.0.0 affected
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I. Basic Information for CVE-2026-69248

Vulnerability Information
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Vulnerability Title
python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees
Source: CVE Program / CVE List V5
Vulnerability Description
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 45.0.0 through 48.0.0, if an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of *.example.com, python-cryptography's verifier accepts which allows escaping outside of the permitted names. The core issue is in DNSConstraint::matches, where a wildcard pattern was treated as matching a more-specific permitted constraint even though *.example.com can expand to sibling names such as bar.example.com outside foo.example.com. This allows acceptance of an invalid certificate chain. This issue is fixed in 49.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Python Cryptographic Authority cryptography 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python Cryptographic Authority cryptography是Python Cryptographic Authority组织开源的一款密码学工具库。 Python Cryptographic Authority cryptography 49.0.0之前版本存在加密问题漏洞，该漏洞源于DNSConstraint::matches中通配符模式被错误地视为匹配更具体的允许约束，可能导致接受无效证书链。
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 < 49.0.0 -

II. Public POCs for CVE-2026-69248

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III. Intelligence Information for CVE-2026-69248

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Patches & Fixes for CVE-2026-69248 (2)

Vendor Advisories for CVE-2026-69248 (1)

Same Patch Batch · pyca · 2026-08-03 · 3 CVEs total

CVE-2026-69249 8.7 HIGH python-cryptography: Duplicate self-signed intermediates can cause exponential path-buildi
CVE-2026-69247 8.2 HIGH cryptography: PKCS#7 EnvelopedData decryption exposes a Bleichenbacher oracle through dist

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-69248

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