CVE-2026-32877
Botan vulnerability analysis and mitigation

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.


SourceNVD

Related Botan vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-34580CRITICAL9.3
  • BotanBotan
  • rust-sequoia-sqv
NoYesApr 07, 2026
CVE-2026-35582HIGH8.8
  • JavaJava
  • gov.nsa.emissary:emissary
NoYesApr 18, 2026
CVE-2026-34582HIGH8.7
  • BotanBotan
  • rust-sequoia-sqv
NoYesApr 07, 2026
CVE-2026-32884MEDIUM5.9
  • BotanBotan
  • botan
NoYesMar 30, 2026
CVE-2026-32883MEDIUM5.9
  • BotanBotan
  • sequoia-sq
NoYesMar 30, 2026

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