CVE-2026-115893Critical· 9.9▾ MidnightWasmtime 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 condi…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 54.5 · likelihood 0 · exploitation 0
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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.
wasmtime < 36.0.19wasmtime >= 37.0.0, < 48.0.7wasmtime >= 49.0.0, < 49.0.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-115892Medium· 5.7Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type
CVE-2026-115889Critical· 9.9Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation
RUSTSEC-2026-0379Critical· 9.9Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction
CVE-2026-115392High· 7.9Filesystem sandbox escape when paths or symlinks contain trailing slashes
CVE-2026-115393Low· 3.8Stores can mix up type indices between engines
CVE-2026-115391Medium· 5.8Guest controlled-size host heap allocation through WASIp3 streams