{"id":"CVE-2026-115393","title":"Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 Cross-Engine Type Confusion","summary":"Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixin…","severity":"low","cvss":3.8,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L","cvssSource":"cna","cwe":["CWE-787"],"vendor":"bytecodealliance","product":"wasmtime","affected":["wasmtime < 24.0.12","wasmtime >= 25.0.0 < 36.0.13","wasmtime >= 37.0.0 < 46.0.2","wasmtime >= 47.0.0 < 47.0.3"],"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T19:13:59.314Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115393","references":[{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hgjw-h833-99q9","label":"GitHub Security Advisory (GHSA-hgjw-h833-99q9)"},{"url":"https://www.vulncheck.com/advisories/wasmtime-before-24.0.12-25.0.0-before-36.0.13-37.0.0-before-46.0.2-and-47.0.0-before-47.0.3-cross-engine-type-confusion","label":"VulnCheck Advisory: Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 Cross-Engine Type Confusion"}],"tags":["cve.org"],"ingestedAt":"2026-10-22T22:00:50.408Z","slug":"CVE-2026-115393","body":"## Overview\n\nWasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixing objects between Engines via Instance::new, StructRefPre::new, or Tag::new can trigger trampoline signature mismatches causing out-of-bounds stack writes, GC heap corruption, or panics.\n\n## Affected\n\n- `wasmtime < 24.0.12`\n- `wasmtime >= 25.0.0 < 36.0.13`\n- `wasmtime >= 37.0.0 < 46.0.2`\n- `wasmtime >= 47.0.0 < 47.0.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":21,"depthScoreParts":{"impact":20.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}