medium5.1
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.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Arm | Mbed Tls | through 4.0.0 |
| Arm | Tf-Psa-Crypto | through 1.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- https://github.com/Mbed-TLS/TF-PSA-Crypto/releases
- https://github.com/Mbed-TLS/mbedtls/releases
- https://mbed-tls.readthedocs.io/en/latest/security-advisories/
- https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/