Improper Validation of Integrity Check Value Affecting org.bouncycastle:bcpg-debug-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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- published5 Aug 2026
- disclosed3 Aug 2026
- creditUnknown
Introduced: 3 Aug 2026
NewCVE-2026-12817 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcpg-debug-jdk18on to version 1.85 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Integrity Check Value in the readBlock() method of PGPAeadInputStream (BcAEADUtil, mirrored in JceAEADUtil), which pre-reads the final 16 bytes but ignores the result and returns EOF without calling doFinal() when the data length is an exact multiple of the chunk size. An attacker can have truncated plaintext accepted as authentic by stripping trailing chunks and the final tag from an AEAD-encrypted message and adjusting the unauthenticated outer packet length. This applies only when the plaintext length is chunk-aligned, and it requires the attacker to modify the transmitted ciphertext and its packet length.