CVE-2026-115889

{"id": "CVE-2026-115889", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-115889", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-26T15:40:36.390562Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.9, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.1}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "bytecodealliance", "product": "wasmtime", "versions": [{"status": "affected", "version": "< 36.0.19"}, {"status": "affected", "version": ">= 37.0.0, < 43.0.0"}]}]}], "published": "2026-10-23T22:16:58.400", "references": [{"url": "https://github.com/bytecodealliance/wasmtime/commit/ba8f7d70caa1825b7f64fa75cd9d03f4a438dae0", "source": "security-advisories@github.com"}, {"url": "https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa", "source": "security-advisories@github.com"}, {"url": "https://github.com/bytecodealliance/wasmtime/pull/12613", "source": "security-advisories@github.com"}, {"url": "https://github.com/bytecodealliance/wasmtime/pull/14818", "source": "security-advisories@github.com"}, {"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19", "source": "security-advisories@github.com"}, {"url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v43.0.0", "source": "security-advisories@github.com"}, {"url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-fmxm", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-197"}, {"lang": "en", "value": "CWE-843"}]}], "descriptions": [{"lang": "en", "value": "Wasmtime is a runtime for WebAssembly. Prior to 36.0.19 and 43.0.0, the Cranelift compiler backend bit-packs SSA value indices in a way that can silently overflow in release builds when compiling a sufficiently large or specially crafted Wasm function with many SSA values. The overflow can make Cranelift reference incorrect IR values, causing arbitrary miscompilation, type confusion, and other attacker-controlled effects that may escape the Wasm sandbox on any architecture using the default Cranelift backend. This issue is fixed in versions 36.0.19 and 43.0.0."}], "lastModified": "2026-10-26T18:17:38.213", "sourceIdentifier": "security-advisories@github.com"}