--- title: "CVE-2026-115893: Wasmtime - Sandbox Escape" description: "Wasmtime < 36.0.19, 48.0.7, and 49.0.4 contains a sandbox escape caused by incorrect conditional branch target compilation of br_table instruction with over 256,000 targets in Cranelift backend on aarch64, letting user-controlled Wasm modules escape sandbox, exploit requires crafted Wasm module." url: https://panop.io/threat-heartbeat/CVE-2026-115893/ --- # CVE-2026-115893 Wasmtime - Sandbox Escape Wasmtime < 36.0.19, 48.0.7, and 49.0.4 contains a sandbox escape caused by incorrect conditional branch target compilation of br\_table instruction with over 256,000 targets in Cranelift backend on aarch64, letting user-controlled Wasm modules escape sandbox, exploit requires crafted Wasm module. CVSS base score 9.9 /10 Critical CISA KEV Not listed Public exploit None known Authentication Required EPSS 0.79% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115893) ## Details Type Sandbox Escape Impact Remote Code Execution CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Published 23 October 2026 Updated 25 October 2026 Weakness [CWE-691](https://cwe.mitre.org/data/definitions/691.html) ## Vendor fix Update to versions 36.0.19, 48.0.7, or 49.0.4 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-115893](https://nvd.nist.gov/vuln/detail/CVE-2026-115893) - [https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd](https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd) - [https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618](https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618) - [https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe](https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe) - [https://github.com/bytecodealliance/wasmtime/pull/14818](https://github.com/bytecodealliance/wasmtime/pull/14818) - [https://github.com/bytecodealliance/wasmtime/pull/14819](https://github.com/bytecodealliance/wasmtime/pull/14819) - [https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19](https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19) - [https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4](https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4) - [https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa](https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa) - [https://github.com/bytecodealliance/wasmtime/pull/14820](https://github.com/bytecodealliance/wasmtime/pull/14820) - [https://github.com/bytecodealliance/wasmtime/pull/14826](https://github.com/bytecodealliance/wasmtime/pull/14826) - [https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7](https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7) - [https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)