CVE-2026-25834

Name: CVE-2026-25834
Creator: NVD / NIST
Published: 2026-04-01T18:16:28.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.14%

Last modified Jun 17, 2026

CVE-2026-25834 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.. EPSS estimates a 0.14% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

EPSS Probability

0.14%

3.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Trustedfirmware	Mbed Tls	>= 3.3.0, < 3.6.6
Trustedfirmware	Mbed Tls	4.0.0

References

https://mbed-tls.readthedocs.io/en/latest/security-advisories/Vendor Advisory
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-sigalg-injection/Vendor Advisory

Timeline

Published: Apr 1, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-25834?

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

How severe is CVE-2026-25834?

CVE-2026-25834 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.14% probability of exploitation in the next 30 days.

How do I fix CVE-2026-25834?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-25834?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST