CVE-2026-32884

Description

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.

How to fix CVE-2026-32884

To remediate CVE-2026-32884, upgrade the affected package to a fixed version below.

• —upgrade to 3.11.0-r0 or later
• —no fix listed
• —no fix listed

Is CVE-2026-32884 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 3.11.0-r0
• from 0
• from 0

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2026-32884
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-32884