What is CVE-2026-34874?

CVE-2026-34874 is a high-severity vulnerability in Trustedfirmware Mbed_tls, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-04-01.

How severe is CVE-2026-34874?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Trustedfirmware Mbed_tls

CVE-2026-34874

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.

EPSS: 0.001 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Trustedfirmware Mbed_tls — versions 4.0.0
N/a — versions n/a

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

cve@mitre.org (Vendor Advisory)
cve@mitre.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-34874?: CVE-2026-34874 is a high-severity vulnerability in Trustedfirmware Mbed_tls, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-04-01.
How severe is CVE-2026-34874?: High severity. CVSS v3 base score is 7.5 out of 10.