CVE catalog

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

[CVE catalog]

Severity
Critical · CVSS 9.3
Published
Source
[NVD] · [CVE record]
EPSS
0.45% · Oct 25, 2026

A flaw was found in Botan, a C++ cryptography library. Due to a misleading function name and an assumption in path validation logic, an end entity certificate could be incorrectly accepted as a trusted root. This occurs when the end entity certificate's Distinguished Name (DN) and Subject Key Identifier (SKI) match those of any trusted root certificate in the store, even if the certificates are not identical. This vulnerability allows for a bypass of certificate validation, potentially enabling an attacker to present a malicious certificate that is trusted by the system. Botan: Botan: Certificate validation bypass due to incorrect certificate matching The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
CpebotanNot reportedNot reportedunknown
Alpinebotan33.243.11.1-r0fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Alpinebotan3apk3.243.11.1-r0Not reportedALPINE-CVE-2026-34580Not reported

OpenFactory catalog packages

No matching packages in this catalog.

Observed:

References

[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]