CVE-2026-44266
Elo: Remote Code Execution in Elo Ruby backend via unescaped `#{...}` interpolation in emitted string literals and subtype-constraint labels
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.
Fixes and workarounds
Fix
@enspirit/elo (npm): OSV reports a fixed version 1.0.1. Check the advisory for supported release branches.
Source: OSV GHSA-7w38-ggh5-v542Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| elo enspirit |
< 1.0.1 (affected) | CNA: GitHub_M |
@enspirit/elo@enspirit/elo
npm |
≥ 0; < 1.0.1 (affected, semver); OSV events: introduced 0; fixed 1.0.1Source events (semver)Other versions: unaffected |
OSV GHSA-7w38-ggh5-v542 |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 9.8 critical |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/enspirit/elo/security/advisories/GHSA-7w38-ggh5-v542CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/enspirit/elo/commit/51b869963fbe445c18328714a7ccfbd76b21ba38CNA: GitHub_M · x_refsource_MISC
- https://github.com/enspirit/elo/commit/d2a89a8db76a244eb740687524a7e8529b7554b5CNA: GitHub_M · x_refsource_MISC
- https://github.com/advisories/GHSA-7w38-ggh5-v542OSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-7w38-ggh5-v542OSV / GitHub Security Advisories · osv
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