# Elo Ruby backend has Remote Code Execution via unescaped \`#{...}\` interpolation in emitted string literals and subtype-constraint labels

Advisory record · `GHSA-7w38-ggh5-v542`

- **Identifiers:** `GHSA-7w38-ggh5-v542` · `CVE-2026-44266`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-94](https://cwe.mitre.org/data/definitions/94.html) · [CWE-116](https://cwe.mitre.org/data/definitions/116.html) · [CWE-1336](https://cwe.mitre.org/data/definitions/1336.html)
- **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md) · [CWE-116](https://agentprime.io/advisories/tag/cwe-116.md)
- **Published:** 3 Nov 2026
- **Updated:** 3 Nov 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 3 Nov 2026, 17:51 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `@enspirit/elo` (npm): affected `<1.0.1`; fixed in `1.0.1`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0100, the 62nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 3 Nov 2026, 17:51 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-44266)
- 3 Nov 2026, 17:51 UTC: [Confirmed by GitHub Advisory Database](https://github.com/advisories/GHSA-7w38-ggh5-v542)
- 3 Nov 2026, 17:55 UTC: First seen by agentprime
- 3 Nov 2026, 18:02 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-7w38-ggh5-v542)
- 3 Nov 2026, 18:18 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-44266)

## Sources

- [GitHub Advisory Database: GHSA-7w38-ggh5-v542](https://github.com/advisories/GHSA-7w38-ggh5-v542)
- [OSV: GHSA-7w38-ggh5-v542](https://osv.dev/vulnerability/GHSA-7w38-ggh5-v542)
- <https://github.com/enspirit/elo/security/advisories/GHSA-7w38-ggh5-v542>
- <https://github.com/enspirit/elo/commit/51b869963fbe445c18328714a7ccfbd76b21ba38>
- <https://github.com/enspirit/elo/commit/d2a89a8db76a244eb740687524a7e8529b7554b5>
- <https://github.com/enspirit/elo>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-7w38-ggh5-v542>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-7w38-ggh5-v542/>. Everything for agents: <https://agentprime.io/llms.txt>.