Insufficient Verification of Data Authenticity Affecting org.bouncycastle:bcjmail-jdk18on package, versions [,1.85)
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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- published4 Aug 2026
- disclosed3 Aug 2026
- creditUnknown
Introduced: 3 Aug 2026
NewCVE-2026-59641 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcjmail-jdk18on to version 1.85 or higher.
Overview
Affected versions of this package are vulnerable to Insufficient Verification of Data Authenticity through a trusted signer-asserted timestamp in the getSignatureTime() method of the S/MIME validator, which returns the CMS signingTime signed attribute and passes it to PKIXCertPathReviewer via usedParameters.setDate(). An attacker holding an expired or revoked signing key can make a signature validate as trusted by setting signingTime to an instant before the revocation or expiry, so the certificate validity and CRL revocation checks run at that chosen time and both isValidCertPath() and ValidationResult.isValidSignature() return true. This requires the signing certificate to chain to a trusted anchor and the application to rely on the S/MIME validator for signature trust, and no RFC 3161 timestamp token is checked to constrain the asserted time against the current time.