Improper Validation of Integrity Check Value Affecting bouncycastle.cryptography package, versions [,2.7.0)
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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Test your applications- Snyk IDSNYK-DOTNET-BOUNCYCASTLECRYPTOGRAPHY-20537026
- published6 Oct 2026
- disclosed2 Oct 2026
Introduced: 2 Oct 2026
NewCVE-2026-103601 (opens in a new tab)How to fix?
Upgrade BouncyCastle.Cryptography to version 2.7.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Integrity Check Value via the ProcessPacket decryption paths in CcmBlockCipher and KCcmBlockCipher. An attacker can recover decrypted ciphertext bytes by sending a forged CCM/KCCM message to an application that exposes the caller-supplied output buffer after decryption fails, such as through buffer reuse or logging. When the authentication tag check fails, the decrypted plaintext has already been written into that buffer, letting the attacker obtain plaintext from ciphertexts of their choosing and causing disclosure of data that the caller expected to discard on failure.