CVE-2026-34874

HIGH

Mbed TLS <3.6.5/4.0.0 - DoS

Title source: llm

Description

An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.

References (2)

https://mbed-tls.readthedocs.io/en/latest/security-advisories/

https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-null-pointer-dereference-x509/

Scores

CVSS v3 7.5

EPSS 0.0007

EPSS Percentile 21.8%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-476

Status published

Products (2)

arm/mbed_tls 4.0.0

arm/mbed_tls 3.5.0 - 3.6.6

Published Apr 01, 2026

Tracked Since Apr 02, 2026