Elo: Ruby backend arbitrary code execution (CVE-2026-44266)
Elo versions prior to 1.0.1 are vulnerable to arbitrary code execution in the Ruby backend due to improper escaping of input within Ruby double-quoted strings.
CVE search metadata
CVE search record: CVE-2026-44266. Severity: critical. CVSS: 9.8. KEV: no. Brief: Elo: Ruby backend arbitrary code execution (CVE-2026-44266). Brief link: https://feed.craftedsignal.io/briefs/2026-11-elo-ruby-code-injection/
Triage facts
Revision 2- Evidence
- Unknown
- Severity
- Critical
- Sources
- 2 public sources
- Freshness
- Revision 2Nov 3, 20:16 UTC
- Vulnerabilities
- 1 CVE
- Source quality
- A2Roughly even chance
Revision history 1 entry · Revision 2
- Revision 2
poc_available
Changed: affected_vendors, claim_state, has_poc, lastmod, poc_references, references, updates
Sources: 1
Elo, a functional expression language, contains a vulnerability in its Ruby backend (src/compilers/ruby.ts). Attacker-controlled text is embedded into Ruby double-quoted strings without escaping '#', allowing Ruby interpolation to become executable. A failing labelled subtype constraint or an ordinary string literal can lead to Ruby code and shell command execution via backticks. Affected entry points include the /try playground (Ruby target), bin/eloc -t ruby -x, and defaultFormats.elo.parse() followed by Ruby emission. This issue is fixed in version 1.0.1.