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.
History

Wed, 01 Apr 2026 23:45:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-385
References
Metrics cvssV3_1

{'score': 5.1, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-01T20:00:06.815Z

Reserved: 2025-12-01T00:00:00.000Z

Link: CVE-2025-66442

cve-icon Vulnrichment

Updated: 2026-04-01T19:58:42.109Z

cve-icon NVD

Status : Received

Published: 2026-04-01T20:16:22.107

Modified: 2026-04-01T20:16:22.107

Link: CVE-2025-66442

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.