CVE-2026-32877
High
Description
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.
SeverityHigh
CVSS8.2
Exploit probability—
ProductBotan
PublishedMar 30, 2026
First seenMar 30, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- botan_project botan3.11.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| botan_project botan | 2.3.0 ≤ v < 3.11.0 | 3.11.0 |
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