CVE-2026-25834

EUVD-2026-17967
Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 3.45%
Affected Products (NVD)
VendorProductVersion
trustedfirmwarembed_tls
3.3.0 ≤
𝑥
< 3.6.6
trustedfirmwarembed_tls
4.0.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
mbedtls
bookworm
2.28.3-1
fixed
bullseye
2.16.9-0.1
fixed
bullseye (security)
2.16.9-0.1+deb11u4
fixed
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-sigalg-injection/