Timing Side Channel Vulnerability in Mbed TLS and TF-PSA-Crypto
CVE-2025-66442

5.1MEDIUM

Key Information:

Vendor

Mbed TLS

Status
Mbed TLS
Vendor
CVE Published:
1 April 2026

What is CVE-2025-66442?

A timing side channel vulnerability exists in Mbed TLS and TF-PSA-Crypto, affecting versions 4.0.0 and 1.0.0 respectively. This issue arises during RSA and CBC/ECB decryption processes when utilizing LLVM's select-optimize feature, potentially allowing attackers to exploit timing discrepancies to extract sensitive information. Users are advised to review the provided security advisories and implement necessary mitigations.

References

https://github.com/Mbed-TLS/mbedtls/releases
https://mbed-tls.readthedocs.io/en/latest/security-adviso...
https://github.com/Mbed-TLS/TF-PSA-Crypto/releases

CVSS V3.1

Score:
5.1
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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