CVE-2026-34874

EUVD-2026-18003
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 20.24%
Affected Products (NVD)
VendorProductVersion
trustedfirmwarembed_tls
3.5.0 ≤
𝑥
< 3.6.6
trustedfirmwarembed_tls
4.0.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
mbedtls
bookworm
no-dsa
bullseye
vulnerable
bullseye (security)
vulnerable
forky
3.6.7-3
fixed
sid
3.6.7-3
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
mbedtls
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
xenial
ignored
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
ovmf-202408
suse enterprise sap 15 SP7
150700.3.18.1
fixed
suse enterprise server 15 SP7
150700.3.18.1
fixed
ovmf-tools-202408
suse enterprise sap 15 SP7
150700.3.18.1
fixed
suse enterprise server 15 SP7
150700.3.18.1
fixed
qemu-ovmf-x86_64-202408
suse enterprise sap 15 SP7
150700.3.18.1
fixed
suse enterprise server 15 SP7
150700.3.18.1
fixed
qemu-uefi-aarch64-202408
suse enterprise sap 15 SP7
150700.3.18.1
fixed
suse enterprise server 15 SP7
150700.3.18.1
fixed
Common Weakness Enumeration
References
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/