5.9Medium
CVE-2026-32883Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Bypass
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.
Weakness (CWE):
CWE-347
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| botan project | botan | 3.0.0 – < 3.11.0 | |
| randombit | botan | >= 3.0.0, < 3.11.0 |
References and patches
CPE matches (NVD) (1)
cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*≥ 3.0.0 < 3.11.0