Vulnerability in Botan_project Botan
CVE-2026-34580
Botan is a C++ cryptography library. In 3.11.0, the function Certificate_Store::certificate_known had a misleading name; it would return true if any certificate in the store had a DN (and subject key identifier, if set) matching that of th…
Vulnerability class: Improper Certificate Validation
EPSS: 0.002 (16.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Botan_project Botan — versions 3.11.0
- Randombit Botan — versions >= 3.11.0, < 3.11.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-34580?
- CVE-2026-34580 is a high-severity vulnerability in Botan_project Botan, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-04-07.
- How severe is CVE-2026-34580?
- High severity. CVSS v3 base score is 7.5 out of 10.