{"cve":"CVE-2026-24116","nvd":{"published":"2026-01-27T19:16:16.180","modified":"2026-06-17T10:22:39.380","status":"Analyzed","description":"Wasmtime is a runtime for WebAssembly. Starting in version 29.0.0 and prior to version 36.0.5, 40.0.3, and 41.0.1, on x86-64 platforms with AVX, Wasmtime's compilation of the `f64.copysign` WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but unless there is another bug in Cranelift this data is not visible to WebAssembly guests. Wasmtime 36.0.5, 40.0.3, and 41.0.1 have been released to fix this issue. Users are recommended to upgrade to the patched versions of Wasmtime. Other affected versions are not patched and users should updated to supported major version instead. This bug can be worked around by enabling signals-based-traps. While disabling guard pages can be a quick fix in some situations, it's not recommended to disabled guard pages as it is a key defense-in-depth measure of Wasmtime.","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":4.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-125"],"references":["https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.memory_guard_size","https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.signals_based_traps","https://docs.wasmtime.dev/stability-release.html","https://github.com/bytecodealliance/wasmtime/commit/728fa07184f8da2a046f48ef9b61f869dce133a6","https://github.com/bytecodealliance/wasmtime/commit/799585fc362fcb991de147dd1a9f2ba0861ed440"],"products":["bytecodealliance:wasmtime"],"source":"nvd","synced_at":"2026-10-19T22:21:16.563232421+00:00"},"epss":{"cve":"CVE-2026-24116","score":0.00246,"percentile":0.15891,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vc8c-j3xm-xj73","url":"https://osv.dev/vulnerability/GHSA-vc8c-j3xm-xj73","summary":"Wasmtime segfault or unused out-of-sandbox load with f64.copysign operator on x86-64","modified":"2026-09-10T03:50:59.266808219Z","packages":[{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=29.0.0 <36.0.5"],"fixed":["36.0.5"]},{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=37.0.0 <40.0.3"],"fixed":["40.0.3"]},{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=41.0.0 <41.0.1"],"fixed":["41.0.1"]}]},{"id":"RUSTSEC-2026-0006","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0006","summary":"Wasmtime segfault or unused out-of-sandbox load with `f64.copysign` operator on x86-64","modified":"2026-10-12T18:00:13.559880161Z","packages":[{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=29.0.0 <36.0.5",">=37.0.0 <40.0.3",">=41.0.0 <41.0.1"],"fixed":["36.0.5","40.0.3","41.0.1"]}]}],"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."]}