{"id":"CVE-2025-66442","details":"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.","modified":"2026-07-11T04:03:30.067560699Z","published":"2026-04-01T00:00:00Z","database_specific":{"cna_assigner":"mitre","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66442.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66442.json"},{"type":"ADVISORY","url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/"},{"type":"ADVISORY","url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66442"},{"type":"PACKAGE","url":"https://github.com/Mbed-TLS/TF-PSA-Crypto/releases"},{"type":"PACKAGE","url":"https://github.com/Mbed-TLS/mbedtls/releases"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mbed-tls/mbedtls","events":[{"introduced":"0"},{"fixed":"ec4044008d2d069da38288bc76b0fee34ec78646"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"4.0.0"},{"last_affected":"1.0.0"}],"source":["DESCRIPTION","CPE_RANGE"],"cpe":"cpe:2.3:a:arm:tf-psa-crypto:*:*:*:*:*:*:*:*"}},{"type":"GIT","repo":"https://github.com/mbed-tls/tf-psa-crypto","events":[{"introduced":"0"},{"fixed":"76920edddcad00ac41b248e12d937b845df7bedb"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.0.0"}],"source":"DESCRIPTION"}}],"versions":["v2.26.0","mbedtls-2.26.0","v2.24.0","mbedtls-2.24.0","mbedtls-2.19.1","mbedtls-2.22.0d0","mbedtls-2.21.0","mbedtls-2.20.0","mbedtls-2.20.0d0","mbedtls-2.19.0d2","mbedtls-2.19.0","mbedtls-2.19.0d1","mbedtls-2.16.0","mbedtls-2.14.0","mbedtls-2.13.1","mbedtls-2.13.0","mbedtls-2.12.0","mbedtls-2.11.0","mbedtls-2.10.0","mbedtls-2.7.0","mbedtls-2.9.0","mbedtls-2.8.0","mbedtls-2.8.0-rc1","mbedtls-2.7.0-rc1","mbedtls-2.6.0","mbedtls-2.6.0-rc1","mbedtls-2.5.1","mbedtls-2.5.0","mbedtls-2.4.0","mbedtls-2.2.1","yotta-2.3.1","mbedtls-2.3.0","mbedtls-2.2.0","mbedos-release-15-11","mbedos-techcon-oob2","mbedtls-2.1.2","mbedtls-2.1.0","mbedtls-2.1.1","beta-oob-2","mbedtls-2.0.0","polarssl-1.3.9","polarssl-1.3.8","polarssl-1.3.7","polarssl-1.3.6","polarssl-1.3.5","polarssl-1.3.4","polarssl-1.3.3","polarssl-1.3.2","polarssl-1.3.1","polarssl-1.3.0","polarssl-1.3.0-rc0","polarssl-1.2.6","polarssl-1.2.5","polarssl-1.2.4","polarssl-1.2.2","polarssl-1.2.1","polarssl-1.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66442.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}