PT-2026-29590 · Arm+2 · Mbed Tls+1

Published 2026-04-01 · Updated 2026-04-03 · CVE-2025-66442

Positive Technologies (AI Summary)

CVSS v3.1

5.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mbed TLS versions prior to 4.0.1 TF-PSA-Crypto versions prior to 1.0.1

Description A compiler-induced timing side channel exists in RSA and CBC/ECB decryption. This issue occurs specifically when using the select-optimize feature of the LLVM compiler. A timing side channel is a vulnerability where the time taken to execute certain operations varies based on the input data, potentially allowing an attacker to infer sensitive information.

Recommendations Update Mbed TLS to a version later than 4.0.0. Update TF-PSA-Crypto to a version later than 1.0.0.

Fix

Weakness Enumeration

CWE-385

Related Identifiers

CVE-2025-66442

Affected Products

Mbed Tls

Tf-Psa-Crypto

References · 10

• https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-66442 · Security Note
• https://ubuntu.com/security/CVE-2025-66442 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-66442 · Vendor Advisory
• https://mbed-tls.readthedocs.io/en/latest/security-advisories · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-66442 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-66442 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-66442 · Security Note
• https://github.com/Mbed-TLS/mbedtls/releases · Note
• https://github.com/Mbed-TLS/TF-PSA-Crypto/releases · Note