Improper Verification of Cryptographic Signature Affecting org.bouncycastle:bcpkix-debug-jdk14 package, versions [1.49,1.84)
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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- published15 Apr 2026
- disclosed15 Apr 2026
- creditNicholas Carlini
Introduced: 15 Apr 2026
CVE-2026-5588 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcpkix-debug-jdk14 to version 1.84 or higher.
Overview
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature due to the verify(byte[] expected) function in JcaContentVerifierProviderBuilder. An attacker can forge a protected CMP/PKI message by supplying an empty composite signature sequence that leaves no signature entries checked while still satisfying the composite verifier setup. This lets an unauthenticated message be accepted as valid, allowing tampering with CMP protocol messages and impersonation of a trusted sender.