EUVD-2026-17210CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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3Description
Botan is a C++ cryptography library. From version 2.3.0 to before version 3.11.0, during SM2 decryption, the code that checked the authentication code value (C3) failed to check that the encoded value was of the expected length prior to comparison. An invalid ciphertext can cause a heap over-read of up to 31 bytes, resulting in a crash or potentially other undefined behavior. This issue has been patched in version 3.11.0.
Analysis
Heap over-read in Botan C++ cryptography library versions 2.3.0 through 3.10.x allows remote, unauthenticated attackers to trigger crashes or undefined behavior during SM2 decryption. The vulnerability stems from insufficient length validation of authentication code (C3) values in SM2 ciphertexts, enabling reads of up to 31 bytes beyond allocated heap memory. …
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Remediation
Within 24 hours: Identify all systems and applications using Botan library versions 2.3.0-3.10.x via dependency scanning and asset inventory. Within 7 days: Establish upgrade plan to Botan 3.11.0 or later, prioritizing production systems handling SM2 decryption or untrusted external ciphertexts. …
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