Medium severity5.1NVD Advisory· Published Apr 1, 2026· Updated Apr 3, 2026

CVE-2025-66442

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.

Affected products

Arm/Mbed Tls
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Range: <=4.0.0
Arm/Tf Psa Crypto
cpe:2.3:a:arm:tf-psa-crypto:*:*:*:*:*:*:*:*
Range: <=1.0.0

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

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

News mentions

No linked articles in our index yet.

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