{"id":"CVE-2026-50185","summary":"RustCrypto Cmov/CmovEq on aarch64 can produce wrong results if high-bits of registers are set","details":"RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. From 0.1.1 until 0.5.4, the aarch64 implementations of Cmov and CmovEq in cmov/src/backends/aarch64.rs assume high bits are zero-extended when loading values smaller than a register, so set high bits such as [8..] in a Cmov selector or [16..] of self or other in the u16 and i16 CmovEq implementations can cause left.cmovz(&right, condition) to produce incorrect output. This issue is fixed in version 0.5.4.","aliases":["GHSA-3rjw-m598-pq24"],"modified":"2026-08-20T03:54:24.708419814Z","published":"2026-07-17T18:35:02.078Z","related":["CGA-3m4q-6rqr-jxrw"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-758"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50185.json"},"references":[{"type":"WEB","url":"https://github.com/RustCrypto/utils/releases/tag/cmov-v0.5.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50185.json"},{"type":"ADVISORY","url":"https://github.com/RustCrypto/utils/security/advisories/GHSA-3rjw-m598-pq24"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50185"},{"type":"FIX","url":"https://github.com/RustCrypto/utils/commit/dba6c355c9f241e3726d5ec2a68f9f3b519f6063"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rustcrypto/utils","events":[{"introduced":"dfb4be5e2a0663e9c72dd1330871557d0bdd6384"},{"fixed":"5c7e4f9bb31af81bf766360e836b6d633b84dbff"},{"fixed":"dba6c355c9f241e3726d5ec2a68f9f3b519f6063"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:rustcrypto:cmov:*:*:*:*:*:rust:*:*","extracted_events":[{"introduced":"0.1.1"},{"fixed":"0.5.4"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50185.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}