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.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-e7d1590ecd advisory.

    Improve stack protection

    ----

    Fix security vulnerabilities CVE-2026-32877,CVE-2026-32883,CVE-2026-32884,CVE-2026-34580,CVE-2026-34582


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:20566-1 advisory.

    This update for Botan fixes the following issue:

    - CVE-2026-32884: Certificate validation bypass due to mixed-case Common Name in X.509 certificates     (bsc#1261993).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-32884)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
310592	Fedora 44 : botan3 (2026-e7d1590ecd)	Nessus	Fedora Local Security Checks	critical
309141	openSUSE 16 Security Update : Botan (openSUSE-SU-2026:20566-1)	Nessus	SuSE Local Security Checks	medium
304748	Linux Distros Unpatched Vulnerability : CVE-2026-32884	Nessus	Misc.	medium

Detections

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CVE-2026-32884

medium

Tenable Plugins

critical

medium

medium