CVE-2025-66442

5.1 MEDIUM

Published: April 01, 2026 Modified: April 03, 2026

Description

In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only occurs with LLVM's select-optimize feature. TF-PSA-Crypto through 1.0.0 is also affected.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/Mbed-TLS/TF-PSA-Crypto/releases

Source: cve@mitre.org

Release Notes

https://github.com/Mbed-TLS/mbedtls/releases

Source: cve@mitre.org

Release Notes

https://mbed-tls.readthedocs.io/en/latest/security-advisories/

Source: cve@mitre.org

Vendor Advisory

https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/

Source: cve@mitre.org

Vendor Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score

5.1 / 10.0

EPSS (Exploit Probability)

0.0%

6th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-385

Affected Vendors

arm

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