Vulnerability · Published Aug 7, 2026 · Assigned by EEF

CVE-2026-66838SQL injection via the :comment option in Postgrex.stream/4

Medium 5.9

In plain English

A medium-severity SQL injection in postgrex from elixir-ecto. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 4.0)5.9Medium

Exploit odds (30 days)0.4%top 65.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
elixir-ecto	postgrex	0.19.3 – before 0.22.4
elixir-ecto	postgrex	4971a2722fa72f8e1b54a2c403cad4c43916e36d – before *

Weakness: CWE-89 · Vector: 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

In plain English

Official description

Affected products (as reported)

References