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      <title>CVE-2026-103601 — CcmBlockCipher and KCcmBlockCipher leave unverified plaintext in the output buffer after a failed tag check</title>
      <link>https://db.gcve.eu/vuln/cve-2026-103601</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Legion of the Bouncy Castle Inc. bc-csharp&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Legion of the Bouncy Castle Inc. bc-csharp&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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