CVE-2026-34873 | BDVDB-2026-324252 Detail

Description#

An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

No public exploit known

9.1 Critical

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 16.5.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Authentication Issues

No specific action is recorded in the source data. Check the references for vendor guidance.

No version data in the source record.

Not available

9.1 Critical

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

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).