CVE-2025-66442

Published: Apr 1, 2026

Modified: Apr 1, 2026

PUBLISHED

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.

Vendor	Product	Versions
n/a	n/a	affected `n/a`

References

https://github.com/Mbed-TLS/mbedtls/releases

https://mbed-tls.readthedocs.io/en/latest/security-advisories/

https://github.com/Mbed-TLS/TF-PSA-Crypto/releases

https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/

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CVE-2025-66442

Description

Affected Products

References