Is CVE-2026-115893 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-115893?

CVE-2026-115893 has a CVSS v3 severity of CRITICAL (9.9).

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CVE-2026-115893

Description

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.