CVE-2026-32877: high-severity vulnerability in randombit botan
Botan: Heap Buffer Over-read in SM2 Decryption via Undersized C3 Hash Field
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Affected products
randombit · botanRelated CVEs — randombit botan
In the same product, most dangerous first.
CVE-2024-34702MEDIUMBotan has a Denial of Service Due to Excessive Name ConstraintsEPSS 0.8%CVE-2024-34703HIGHBotan Vulnerable to Denial of Service Due to Overly Large Elliptic Curve ParametersEPSS 0.5%CVE-2026-34580CRITICALBotan has a certificate authentication bypass due to trust anchor confusionEPSS 0.5%CVE-2026-118769CRITICALBotan: Integer overflow when reporting block size in FFI can cause memory corruptionEPSS 0.4%CVE-2026-44378MEDIUMBotan: Quadratic complexity decoding BER indefinite length encodingsEPSS 0.3%CVE-2024-39312MEDIUMBotan has an Authorization Error due to Name Constraint Decoding BugEPSS 0.3%