CVE-2026-58225 SQL injection in postgrex
Attackers can cause denial of service in Postgrex notification connections by injecting dollar-quote delimiters into channel names, breaking reconnection logic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58225?
CVE-2026-58225 is a low-severity SQL injection vulnerability in elixir-ecto postgrex, published on 10 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
SQL Injection vulnerability in elixir-ecto postgrex allows an attacker who can influence a LISTEN channel name to inject SQL into the reconnect replay query, causing a denial of service of the notification connection.
Postgrex.Notifications sanitizes channel names with quote_channel/1, which doubles double quotes so the name is safe inside a double-quoted identifier. This protects the single-statement LISTEN and UNLISTEN paths. On every (re)connect, however, handle_connect/1 replays all registered channels at once by concatenating their LISTEN statements and wrapping them in a dollar-quoted anonymous code block (DO $$BEGIN ... END$$). quote_channel/1 does not escape the $$ dollar-quote delimiter that opens and closes this block.
The listen/3 guards only reject null bytes and names longer than 63 bytes, so a channel name containing $$ passes validation unchanged. Once such a name is embedded, its $$ prematurely terminates the outer dollar-quoted string and PostgreSQL parses the remainder as additional top-level statements. Because handle_connect/1 runs on every (re)connect, the malformed replay query is rejected each time and the notification connection never re-establishes its subscriptions, silently dropping notifications for every channel sharing that connection.
An application is affected when it passes untrusted input (for example a tenant or user identifier) as a channel name to Postgrex.Notifications.listen/3. The double-quote doubling prevents forming a fully valid injected statement, so arbitrary SQL execution is not possible, but the corrupted query reliably breaks the shared notification connection for all tenants, resulting in denial of service.
This issue affects postgrex: from 0.16.0 before 0.22.3.
Weakness: CWE-89
Which versions are affected by CVE-2026-58225?
1 open source package ship an affected version, including postgrex.
| Package | Affected | Fixed in |
|---|---|---|
postgrex Hex | From 0.16.0 | 0.22.3 |
How do I fix CVE-2026-58225?
Upgrade postgrex to 0.22.3 or later.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-58225 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58225 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as EEF-CVE-2026-58225, GHSA-4mw9-4qgj-m97w.