CVE-2026-69248 (GCVE-0-2026-69248)

Vulnerability from cvelistv5 – Published: 2026-08-03 21:21 – Updated: 2026-08-04 15:04
VLAI
Title
python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees
Summary
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 49.0.0, 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.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
Impacted products
Vendor Product Version
pyca cryptography Affected: < 49.0.0
Create a notification for this product.
Show details on NVD website

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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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