CVE-2026-66838

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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://cna.erlef.org/cves/CVE-2026-66838.html	Patch Third Party Advisory
https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388	Exploit Patch Vendor Advisory
https://github.com/elixir-ecto/postgrex/commit/4011be852c99dc61ddb98cb01aa41e8775a0e3dd	Patch
https://github.com/elixir-ecto/postgrex/commit/e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c	Patch
https://osv.dev/vulnerability/EEF-CVE-2026-66838	Patch Third Party Advisory
https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388	Exploit Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-08-07 13:16

Updated : 2026-08-17 14:40

NVD link : CVE-2026-66838

Mitre link : CVE-2026-66838

CVE.ORG link : CVE-2026-66838

JSON object : View

Products Affected

elixir-ecto

postgrex

CWE

CWE-89

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

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