What is CVE-2026-32883?

CVE-2026-32883 is a medium-severity vulnerability in Botan Project, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.9/10. Published 2026-03-30.

How severe is CVE-2026-32883?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Botan Project

CVE-2026-32883

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.

Published 2026-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.002 (8.3th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Botan Project
Randombit Botan — versions >= 3.0.0, < 3.11.0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

github.com/randombit/botan/security/advisories/GHSA-9j2j-hqmc-hf5x (Vendor Advisory)

Frequently asked questions

What is CVE-2026-32883?: CVE-2026-32883 is a medium-severity vulnerability in Botan Project, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.9/10. Published 2026-03-30.
How severe is CVE-2026-32883?: Medium severity. CVSS v3 base score is 5.9 out of 10.