CVE-2026-25834: Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-05-07

Last Updated

2026-09-03

EPSS Score

0.22% (percentile: 10.8%)

Affected Products (1)

Other

• 21780-17084

Security Updates (1)

• Security Update

Revision History

• 2026-05-07: Information published.
• 2026-05-19: Information published.
• 2026-05-31: Information published.
• 2026-06-01: Information published.
• 2026-06-02: Information published.
• 2026-09-03: Information published.