CVE-2026-32877 — Botan: Heap Buffer Over-read in SM2 Decryption via Undersized C3 Hash Field

CVE-2026-32877

Botan: Heap Buffer Over-read in SM2 Decryption via Undersized C3 Hash Field PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
randombit / botan	affected >= 2.3.0, < 3.11.0

CWE

CWE-125

References

https://github.com/randombit/botan/security/advisories/GHSA-7jj6-4r42-w9h6

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.