# SQL injection via the :comment option in Postgrex.stream/4

Advisory record · `GHSA-3gww-3f36-2388`

- **Identifiers:** `GHSA-3gww-3f36-2388` · `CVE-2026-66838` · `EEF-CVE-2026-66838`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-89](https://cwe.mitre.org/data/definitions/89.html)
- **Tags:** [SQL injection](https://agentprime.io/advisories/tag/sql-injection.md)
- **Published:** 7 Aug 2026
- **Updated:** 8 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Aug 2026, 12:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `postgrex` (Hex): affected `>=0.19.3, <0.22.4`; fixed in `0.22.4`

## 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

- 5.9 Medium, CVSS 4.0: `CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`, from CNA (EEF)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0040, the 34th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:25 UTC: First seen by agentprime
- 31 Oct 2026, 15:25 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/EEF-CVE-2026-66838)

## Sources

- [GitHub Advisory Database: GHSA-3gww-3f36-2388](https://github.com/advisories/GHSA-3gww-3f36-2388)
- [OSV: GHSA-3gww-3f36-2388](https://osv.dev/vulnerability/GHSA-3gww-3f36-2388)
- <https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388>
- <https://cna.erlef.org/cves/CVE-2026-66838.html>
- <https://github.com/elixir-ecto/postgrex/commit/e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c>
- <https://github.com/elixir-ecto/postgrex/commit/4011be852c99dc61ddb98cb01aa41e8775a0e3dd>
- <https://hex.pm/packages/postgrex>

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-3gww-3f36-2388>, 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-3gww-3f36-2388/>. Everything for agents: <https://agentprime.io/llms.txt>.