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

Quick assessment

Affected
elixir-ecto postgrex
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

elixir-ecto Postgrex是elixir-ecto组织的一款基于Elixir的数据库驱动连接工具。 elixir-ecto Postgrex 0.19.3版本至0.22.4之前版本存在SQL注入漏洞，该漏洞源于对SQL命令中特殊元素的中和不当，攻击者可通过Postgrex.stream/4的:comment选项注入SQL，关闭注释分隔符并扩展流式语句，以连接的角色执行任意子句。

CVSS 5.9 · Medium EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
elixir-ecto postgrex 0.19.3< 0.22.4 affected
4971a2722fa72f8e1b54a2c403cad4c43916e36d< * affected
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I. Basic Information for CVE-2026-66838

Vulnerability Information
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Vulnerability Title
SQL injection via the :comment option in Postgrex.stream/4
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: CVE Program / CVE List V5
Vulnerability Title
elixir-ecto Postgrex SQL注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
elixir-ecto Postgrex是elixir-ecto组织的一款基于Elixir的数据库驱动连接工具。 elixir-ecto Postgrex 0.19.3版本至0.22.4之前版本存在SQL注入漏洞，该漏洞源于对SQL命令中特殊元素的中和不当，攻击者可通过Postgrex.stream/4的:comment选项注入SQL，关闭注释分隔符并扩展流式语句，以连接的角色执行任意子句。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
elixir-ecto postgrex 0.19.3 ~ 0.22.4 cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*
elixir-ecto postgrex 4971a2722fa72f8e1b54a2c403cad4c43916e36d ~ * cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-66838

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III. Intelligence Information for CVE-2026-66838

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Patches & Fixes for CVE-2026-66838 (2)

Vendor Advisories for CVE-2026-66838 (3)

IV. Related Vulnerabilities

Same product: postgrex
Same vendor: elixir-ecto
Same weakness: CWE-89

V. Comments for CVE-2026-66838

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