CVE-2026-34877CRITICAL 9.8EPSS p34.0%

CVE-2026-34877CVE-2026-34877

arm / mbed_tls

Description

An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or session structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code execution. This is caused by Incorrect Use of Privileged APIs.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.43% probability of exploitation · percentile 34.0% · 2026-06-19T12:03:05Z
Published2026-04-02
Last modified2026-06-05

Underlying weaknesses· 2

CWE-250CWE-502

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-serialized-data/

2

TypeTargetConfidenceTier
WeaknessExecution with Unnecessary Privilegescwe-2500%live
WeaknessDeserialization of Untrusted Datacwe-5020%live

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