Wildcard Certificate Acceptance Flaw in the Cryptography Package from Python
CVE-2026-69248

6.9MEDIUM

Key Information:

Vendor

Pyca

Status
Cryptography
Vendor
CVE Published:
3 August 2026

What is CVE-2026-69248?

The cryptography package for Python encountered a vulnerability where a wildcard DNS certificate could be incorrectly accepted. Specifically, if an intermediate constrained Certificate Authority (CA) validated the DNS name foo.example.com, and a leaf certificate held a wildcard in its DNS Subject Alternative Name (SAN) such as *.example.com, the verifier erroneously accepted it. This flaw allows for potential certificate chain validation failures, as any subdomain of example.com could be misinterpreted as a valid certificate, including those not specifically permitted. This issue has been addressed in version 49.0.0.

Affected Version(s)

cryptography < 49.0.0

References

https://github.com/pyca/cryptography/security/advisories/...
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https://github.com/pyca/cryptography/pull/14888
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https://github.com/pyca/cryptography/commit/4d035a4225965...
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CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.