{"id":"CVE-2026-115893","sourceIdentifier":"security-advisories@github.com","published":"2026-10-23T22:16:58.820","lastModified":"2026-10-23T22:16:58.947","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"bytecodealliance","product":"wasmtime","versions":[{"version":"< 36.0.19","status":"affected"},{"version":">= 37.0.0, < 48.0.7","status":"affected"},{"version":">= 49.0.0, < 49.0.4","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":9.9,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.1,"impactScore":6.0}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-691"}]}],"references":[{"url":"https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe","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/14818","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14819","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14820","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14826","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/v48.0.7","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4","source":"security-advisories@github.com"},{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm","source":"security-advisories@github.com"}]}