Improper Certificate Validation Affecting bouncycastle.cryptography package, versions [,2.7.0)
Threat Intelligence
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-DOTNET-BOUNCYCASTLECRYPTOGRAPHY-20537034
- published6 Oct 2026
- disclosed2 Oct 2026
Introduced: 2 Oct 2026
NewCVE-2026-103602 (opens in a new tab)How to fix?
Upgrade BouncyCastle.Cryptography to version 2.7.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Certificate Validation in the PkixNameConstraintValidator process. An attacker can bypass name constraints by crafting certificates with an rfc822Name, dNSName, or uniformResourceIdentifier whose host ends with a trailing dot, allowing acceptance of certificates for email addresses, DNS names, or URI hosts that should be excluded, by exploiting the improper comparison of names and constraints without removing the RFC 1034 root-label trailing dot.