{"cve":"CVE-2026-23519","nvd":{"published":"2026-01-15T20:16:05.313","modified":"2026-06-17T10:21:42.970","status":"Analyzed","description":"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. Prior to 0.4.4, the thumbv6m-none-eabi (Cortex M0, M0+ and M1) compiler emits non-constant time assembly when using cmovnz (portable version). This vulnerability is fixed in 0.4.4.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N","score":8.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-203","CWE-208"],"references":["https://github.com/RustCrypto/utils/commit/55977257e7c82a309d5e8abfdd380a774f0f9778","https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp","https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp"],"products":["rustcrypto:cmov"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2026-23519","score":0.00558,"percentile":0.46495,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2gqc-6j2q-83qp","url":"https://osv.dev/vulnerability/GHSA-2gqc-6j2q-83qp","summary":"RustCrypto Utilities cmov: `thumbv6m-none-eabi` compiler emits non-constant time assembly when using `cmovnz`","modified":"2026-09-10T03:50:32.352645465Z","packages":[{"ecosystem":"crates.io","name":"cmov","purl":"pkg:cargo/cmov","ranges":["<0.4.4"],"fixed":["0.4.4"]}]},{"id":"RUSTSEC-2026-0003","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0003","summary":"Non-constant-time code generation on ARM32 targets","modified":"2026-10-23T08:41:35.268663457Z","packages":[{"ecosystem":"crates.io","name":"cmov","purl":"pkg:cargo/cmov","ranges":[">=0.0.0-0 <0.4.4"],"fixed":["0.4.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}