{"id":"RUSTSEC-2026-0380","aliases":["GHSA-897f-g5gm-fmxm"],"title":"Bit-packing in Cranelift compiler causes silent overflow and miscompilation","summary":"Bit-packing in Cranelift compiler causes silent overflow and miscompilation","severity":"critical","cvss":9.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","vendor":"wasmtime","product":"wasmtime","ecosystem":"rust","affected":["wasmtime >= 37.0.0, < 43.0.0"],"patched":["wasmtime 43.0.0"],"published":"2026-10-19","updated":"2026-10-20","sourceUpdated":"2026-10-20T11:15:37.073985819Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2026-0380","references":[{"url":"https://crates.io/crates/wasmtime"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0380.html"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/12613"}],"tags":["osv","rust"],"ingestedAt":"2026-10-21T11:54:42.770Z","slug":"RUSTSEC-2026-0380","body":"## Overview\n\nThis is an entry in the RustSec database for the Wasmtime security advisory\nlocated at\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-fmxm\nFor more information see the GitHub-hosted security advisory.\n\n## Affected packages\n\n- `wasmtime >= 37.0.0, < 43.0.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `wasmtime 43.0.0`","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":54.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}