Fedora 43 binaryen Critical Buffer Overflow Fix FEDORA-2026-fb3e461878

Binaryen is a compiler and toolchain infrastructure library for WebAssembly,

written in C++. It aims to make compiling to WebAssembly easy, fast, and

effective:

* Easy: Binaryen has a simple C API in a single header, and can also be used

from JavaScript. It accepts input in WebAssembly-like form but also accepts

a general control flow graph for compilers that prefer that.

* Fast: Binaryen's internal IR uses compact data structures and is designed for

completely parallel codegen and optimization, using all available CPU cores.

Binaryen's IR also compiles down to WebAssembly extremely easily and quickly

because it is essentially a subset of WebAssembly.

* Effective: Binaryen's optimizer has many passes that can improve code very

significantly (e.g. local coloring to coalesce local variables; dead code

elimination; precomputing expressions when possible at compile time; etc.).

These optimizations aim to make Binaryen powerful enough to be used as a

compiler backend by itself. One specific area of focus is on

WebAssembly-specific optimizations (that general-purpose compilers might not

do), which you can think of as wasm minification , similar to minification for

JavaScript, CSS, etc., all of which are language-specific (an example of such

an optimization is block return value generation in SimplifyLocals).

Fixes CVE-2025-14956 .