Bytecodealliance

The Bytecode Alliance develops a compact but strategically important portfolio of WebAssembly runtimes and compilation infrastructure, including Wasmtime, the WebAssembly Micro Runtime, and Cranelift code generation components, that enable safe execution of untrusted WebAssembly in diverse environments from servers to embedded systems. Despite a focused product footprint, this vendor ranks among the more prominent in the vulnerability landscape, reflecting the critical role these runtimes play in sandboxing and the complexity of implementing memory-safe execution for a new bytecode standard. Vulnerabilities affecting the vendor tend toward serious outcomes and recur through memory-safety weakness classes including out-of-bounds reads and writes, use-after-free conditions, and improper resource allocation that are inherent to low-level runtime design and JIT compilation. Defenders should treat updates to these runtimes as high-priority, particularly in environments where WebAssembly is used to isolate untrusted code or to extend application capabilities; current severity, exploitation activity, and exposure counts are shown alongside this summary.