Improper Validation of Integrity Check Value Affecting org.bouncycastle:bcpkix-jdk15to18 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-2026-12802 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcpkix-jdk15to18 to version 1.85 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Integrity Check Value in CMS AuthEnvelopedData recipient processing, where AbstractRecipient and its recipient classes (such as JceKeyTransRecipient and BcKeyTransRecipient) take the AEAD tag length from the attacker-controlled GCM or CCM ICV length in the content AlgorithmIdentifier without a minimum-length check. An attacker can reduce the authentication tag to a length that makes forgery tractable by setting that MAC length to a small value such as 32 bits, so the recipient verifies against a short tag. The forged message must still verify against the shortened tag, so this enables a feasible brute-force forgery rather than an immediate bypass, and it affects applications decrypting AuthEnvelopedData with no configured minimum tag size.