Elo JavaScript emitter has sandbox escape to arbitrary Node.js / browser code execution via unfiltered `.constructor` member access

Summary An unauthenticated attacker who controls a string passed to any Elo JavaScript-emission path — defaultFormats.elo.parse, the bin/elo CLI, or the live browser playground at elo-lang.org/try — can execute arbitrary code in the host JavaScript runtime. A payload built from the...

EUVD-2026-116111

Elo is a purely functional expression language for no-code tools. Prior to 1.0.1, plain Elo strings supplied to defaultFormats.elo.parse, bin/elo, or elo-lang.org/try can use .constructor.constructor to reach JavaScript Function because the memberaccess handler in src/transform.ts does not reject...