CVE-2026-32877

HIGH

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 8.2
EPSS 0.0028
EPSS Percentile 19.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-125
Status published
Products (2)
botan_project/botan 2.3.0 - 3.11.0
randombit/botan >= 2.3.0, < 3.11.0
Published Mar 30, 2026
Tracked Since Mar 31, 2026