CVE-2026-32884
mediumpriority · track · 0EPSS 0.002 · 6 %ileEURUUSEPSS · scored 2026-10-27
Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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affected products (3)
Products and version ranges known to be affected.
also known as (4)
Other names and identifiers for this entity.
sources
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references (4)
External citations — patches, advisories, analysis.
- https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5cnnvd
- https://github.com/randombit/botan/tagsPatchcnnvd
- https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5enisa_euvd
- https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5Vendor Advisorynvd
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