CVE-2026-25834

MEDIUM 6.5CVE-2026-25834 · Published 01/04/2026 · updated 17/06/2026

In short

CVE-2026-25834 is a MEDIUM (CVSS 6.5) vulnerability affecting mbed tls (trustedfirmware).
Chance of exploitation in the next 30 days (EPSS): 0.14%, higher than 3.4% of all vulnerabilities.
Fix: update to 3.6.6 or later.

Package	Affected versions	Patched versions
mbed tls trustedfirmware	`= 4.0.0≥ 3.3.0, < 3.6.6`	`3.6.6`

Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Package

Affected versions

Patched versions

= 4.0.0≥ 3.3.0, < 3.6.6

3.6.6

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