CVE-2026-103601

Release of unverified plaintext in the CCM (CcmBlockCipher) and DSTU 7624 CCM (KCcmBlockCipher) AEAD modes in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker to obtain decryptions of ciphertexts of their choosing via forged messages sent to an application that lets the output buffer of a failed decryption be observed, for example through buffer reuse or logging, because decryption wrote the recovered plaintext into the caller-supplied output buffer before checking the authentication tag and left it there when the check failed. Only decryption into a caller-supplied buffer is affected; methods that return a newly allocated array are not.

• https://github.com/bcgit/bc-csharp/commit/4ddb1d0bfeae3a81b18f4446d8cc8a7871bd2d9f
• https://github.com/bcgit/bc-csharp/commit/e0868323645a063cb2479646e93c1449dc338de5
• https://github.com/bcgit/bc-csharp/wiki/CVE-2026-103601

• https://github.com/bcgit/bc-csharp/commit/4ddb1d0bfeae3a81b18f4446d8cc8a7871bd2d9f
• https://github.com/bcgit/bc-csharp/commit/e0868323645a063cb2479646e93c1449dc338de5
• https://github.com/bcgit/bc-csharp/wiki/CVE-2026-103601

• UNSCOREDCVE-2026-102759PoC
• UNSCOREDCVE-2026-105280PoC
• MEDIUMCVE-2026-106434
• LOWCVE-2026-109366PoC
• UNSCOREDCVE-2026-15999PoC
• UNSCOREDCVE-2026-16001PoC
• UNSCOREDCVE-2026-54578PoC
• UNSCOREDCVE-2026-54580PoC

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