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CVE-2025-66442

Published: Apr 1, 2026Updated: Apr 3, 2026 Sources: CVE List NVDCWE-385
NVD MITRE
5.1CVSSMEDIUM
EPSS Score
0.3%
Top 81.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-385

Affected Products

n/an/a
mbed tlsarmOSS Libraries
tf-psa-cryptoarmOSS Libraries
armoss-projectGBOSS Librariesaka arm ltd

Exploitability

Official Patch Available

References

https://github.com/Mbed-TLS/mbedtls/releases
github.com
https://mbed-tls.readthedocs.io/en/latest/security-advisories/
mbed-tls.readthedocs.io
https://github.com/Mbed-TLS/TF-PSA-Crypto/releases
github.com
and 1 more references View all →

Timeline

Published
Apr 1, 2026
Last Updated
Apr 3, 2026

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