CVE-2026-32883

MEDIUM

Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Bypass

Title source: cna
STIX 2.1

Description

Botan is a C++ cryptography library. From version 3.0.0 to before version 3.11.0, during X509 path validation, OCSP responses were checked for an appropriate status code, but critically omitted verifying the signature of the OCSP response itself. This issue has been patched in version 3.11.0.

References (1)

Core 1
Core References

Scores

CVSS v3 5.9
EPSS 0.0015
EPSS Percentile 4.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-347
Status published
Products (2)
botan_project/botan 3.0.0 - 3.11.0
randombit/botan >= 3.0.0, < 3.11.0
Published Mar 30, 2026
Tracked Since Mar 31, 2026