Vulnerability details

Elo is a purely functional expression language for no-code tools. Prior to 1.0.1, the Ruby backend in src/compilers/ruby.ts embeds attacker-controlled text in Ruby double-quoted strings without escaping #, so Ruby interpolation forms in the string-literal emitter or the labelled subtype-constraint branch become executable Ruby. The affected entry points include the /try playground with the Ruby target, bin/eloc -t ruby -x, and defaultFormats.elo.parse() followed by Ruby emission. A failing labelled subtype constraint evaluates its message, while an ordinary string literal is evaluated when the compiled Ruby runs, allowing Ruby code and shell command execution through backticks. JavaScript, Python, and SQL emission are not affected by this Ruby-specific path. This issue is fixed in version 1.0.1.

• https://github.com/enspirit/elo/commit/51b869963fbe445c18328714a7ccfbd76b21ba38 x_refsource_MISC
• https://github.com/enspirit/elo/commit/d2a89a8db76a244eb740687524a7e8529b7554b5 x_refsource_MISC
• https://github.com/enspirit/elo/security/advisories/GHSA-7w38-ggh5-v542 x_refsource_CONFIRM