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.
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)
|
History
03 Apr 2026, 20:04
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* cpe:2.3:a:arm:tf-psa-crypto:*:*:*:*:*:*:*:* |
|
| First Time |
Arm tf-psa-crypto
Arm Arm mbed Tls |
|
| References | () https://github.com/Mbed-TLS/TF-PSA-Crypto/releases - Release Notes | |
| References | () https://github.com/Mbed-TLS/mbedtls/releases - Release Notes | |
| References | () https://mbed-tls.readthedocs.io/en/latest/security-advisories/ - Vendor Advisory | |
| References | () https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/ - Vendor Advisory |
01 Apr 2026, 20:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-01 20:16
Updated : 2026-04-03 20:04
NVD link : CVE-2025-66442
Mitre link : CVE-2025-66442
CVE.ORG link : CVE-2025-66442
JSON object : View
Products Affected
arm
- mbed_tls
- tf-psa-crypto
CWE
CWE-385
Covert Timing Channel