Information Exposure 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-20537033
- published6 Oct 2026
- disclosed2 Oct 2026
Introduced: 2 Oct 2026
NewCVE-2026-63567 (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 Information Exposure through IesEngine.DecryptBlock in crypto/src/crypto/engines/IesEngine.cs. An attacker can recover plaintext from captured IES or ECIES ciphertexts by submitting modified ciphertexts for decryption under the same key pair. In block-cipher mode, the engine decrypts and removes padding before verifying the MAC, so padding failures and MAC failures are distinguishable and reveal information needed to iteratively decrypt the message.