CVE-2025-66442

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.

CVSS v3 5.1 MEDIUM

5.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.4 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/Mbed-TLS/TF-PSA-Crypto/releases	Release Notes
https://github.com/Mbed-TLS/mbedtls/releases	Release Notes
https://mbed-tls.readthedocs.io/en/latest/security-advisories/	Vendor Advisory
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:arm:mbed_tls::::::::
	cpe:2.3:a:arm:tf-psa-crypto::::::::

History

No history.

Information

Published : 2026-04-01 20:16

Updated : 2026-06-17 09:56

NVD link : CVE-2025-66442

Mitre link : CVE-2025-66442

CVE.ORG link : CVE-2025-66442

JSON object : View

Products Affected

arm

tf-psa-crypto
mbed_tls

CWE

CWE-385

Covert Timing Channel

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