CVE-2026-66838: Elixir-Ecto Postgrex

High severity, CVSS 8.2. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in elixir-ecto postgrex allows SQL Injection via the :comment option of Postgrex.stream/4. An attacker who can influence that value can close the comment delimiter with */ and extend the streamed statement with their own clauses, which execute under the connection's role. Ecto exposes the same option through Ecto.Repo.stream/2. Postgrex appends the comment by concatenating it into the statement text sent in the Parse message, without escaping or rejecting */. The option is validated by comment_not_present!/1 at every other execution point; stream/4 never calls it. Because Parse accepts a single command, the injection is confined to the streamed statement and further statements cannot be chained. This issue affects postgrex: from 0.19.3 before 0.22.4.

Affected products

• Elixir-Ecto Postgrex: from 0.19.3, before 0.22.4 (fixed in 0.22.4)

Published 2026-08-07. Last modified 2026-08-17.