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.
{
"sources": [
{
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2025-66442",
"database_specific": {
"status": "Analyzed"
},
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66442",
"modified": "2026-04-03T20:04:38.487Z",
"id": "CVE-2025-66442",
"imported": "2026-05-07T15:19:19.810Z",
"published": "2026-04-01T20:16:22.107Z"
},
{
"url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2025-209171",
"html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-209171",
"modified": "2026-04-01T20:00:06Z",
"id": "EUVD-2025-209171",
"imported": "2026-05-07T15:19:16.982Z",
"published": "2026-04-01T00:00:00Z"
}
],
"license": "CC-BY-4.0"
}