CVE-2026-34873CRITICAL 9.1EPSS p15.0%

CVE-2026-34873CVE-2026-34873

trustedfirmware / mbed_tls

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.24% probability of exploitation · percentile 15.0% · 2026-06-19T12:03:05Z
Published2026-04-01
Last modified2026-06-05

Underlying weaknesses· 1

CWE-287

References

  1. https://mbed-tls.readthedocs.io/en/latest/security-advisories/
  2. https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-client-impersonation-while-resuming-tls13-session/

1

TypeTargetConfidenceTier
WeaknessImproper Authenticationcwe-2870%live

Related by meaning· 6

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.