CVE-2026-34582

botan: Botan: Client authentication bypass in TLS 1.3 implementation

Published 7 Apr 2026Modified 24 Jul 2026CWE 841, 166

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Red Hat9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (high).

Description

Botan is a C++ cryptography library. Prior to version 3.11.1, the TLS 1.3 implementation allowed ApplicationData records to be processed prior to the Finished message being received. A server which is attempting to enforce client authentication via certificates can by bypassed by a client which entirely omits Certificate, CertificateVerify, and the Finished message and instead sends application data records. This vulnerability is fixed in 3.11.1.

Affected packages and fixed versions

Source	Package	Fixed in
alpine 3.24	botan3	3.11.1-r0
alpine edge	botan3	3.11.1-r0
debian 13	botan3	3.11.0+dfsg-2
debian 14	botan3	3.11.0+dfsg-2
echo	botan3	3.11.0+dfsg-2
rapidfort debian 12	botan3	0:3.11.0+dfsg-2
rapidfort debian 13	botan3	0:3.11.0+dfsg-2

References

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Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.