CVE-2026-34874 Null dereference in n/a

High 7.5 Published 1 Apr 2026 Updated 1 Apr 2026

An attacker can cause a denial of service via a NULL pointer dereference in Mbed TLS distinguished name parsing.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-34874?

CVE-2026-34874 is a high-severity vulnerability in n/a, published on 1 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-476

Which versions are affected by CVE-2026-34874?

It affects 1 product.

Products include Trustedfirmware Mbed Tls.

How do I fix CVE-2026-34874?

Upgrade to a fixed version.

Is CVE-2026-34874 being exploited?

There is no known exploitation of CVE-2026-34874 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-34874, ECHO-af70-69c6-547c, GHSA-5jpv-5p2x-4fwv, UBUNTU-CVE-2026-34874.