CVE-2026-34582
criticalpriority · track · 36EPSS 0.002 · 14 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.6–9.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://botan.randombit.net/Patchcnnvd
- https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86gcnnvd
- https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86genisa_euvd
- https://access.redhat.com/security/cve/CVE-2026-34582nvd
- https://bugzilla.redhat.com/show_bug.cgi?id=2456285nvd
- https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86gMitigationVendor Advisorynvd
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34582.jsonnvd
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