Improper Certificate Validation Affecting cryptography package, versions [,49.0.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-CRYPTOGRAPHY-18516620
- published4 Aug 2026
- disclosed4 Aug 2026
- creditJack Lloyd
Introduced: 4 Aug 2026
NewCVE-2026-69248 (opens in a new tab)How to fix?
Upgrade cryptography to version 49.0.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Certificate Validation in the DNSConstraint::matches. An attacker can bypass name constraints by presenting a certificate with a wildcard DNS Subject Alternative Name that is improperly validated, allowing acceptance of certificate chains that should be rejected.