CVE-2025-59438 Affecting mbedtls package, versions *


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.03% (10th percentile)

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  • Snyk IDSNYK-UBUNTU2004-MBEDTLS-13653311
  • published17 Jan 2026
  • disclosed21 Oct 2025

Introduced: 21 Oct 2025

CVE-2025-59438  (opens in a new tab)

How to fix?

There is no fixed version for Ubuntu:20.04 mbedtls.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mbedtls package and not the mbedtls package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.

CVSS Base Scores

version 3.1