Exposure of Sensitive Information Through Metadata Affecting org.bouncycastle:bcpg-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-2026-59640 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcpg-jdk18on to version 1.85 or higher.
Overview
Affected versions of this package are vulnerable to Exposure of Sensitive Information Through Metadata via CFB quick-check decryption oracle in the getDataStream() method of PGPSymmetricKeyEncryptedData, reached through PGPPBEEncryptedData, PGPSessionKeyEncryptedData, and OpenPGPMessageProcessor, which checks the two repeated CFB IV bytes and throws PGPDataValidationException before MDC verification completes. An attacker with adaptive chosen-ciphertext access to a decryption endpoint can recover roughly two plaintext bytes per about 2^15 queries by distinguishing the early quick-check failure from a later MDC or parse failure. This affects only the symmetric and session-key decryption paths on SEIPDv1 messages, not PGPPublicKeyEncryptedData which already skips the check, and it requires the endpoint's early and late failures to be distinguishable to the attacker.