Improper Certificate Validation Affecting org.bouncycastle:bcpkix-fips package, versions [1.0.4,1.0.13)[2.0.0,2.0.13)[2.1.0,2.1.13)
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-JAVA-ORGBOUNCYCASTLE-20536909
- published6 Oct 2026
- disclosed3 Oct 2026
- creditYu Bao
Introduced: 3 Oct 2026
NewCVE-2026-71889 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcpkix-fips to version 1.0.13, 2.0.13, 2.1.13 or higher.
Overview
Affected versions of this package are vulnerable to Improper Certificate Validation. PKIXCertPathReviewer.checkNameConstraints() in org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer and org.bouncycastle.x509.PKIXCertPathReviewer. An attacker can get a constrained certificate chain accepted by supplying a leaf certificate whose subject DN or subjectAltName violates the issuing CA’s NameConstraints extension. When an application relies on the reviewer’s isValidCertPath() result for trust decisions, it accepts an end-entity certificate that the CA was not authorized to issue, allowing unauthorized certificate acceptance.