CVE-2026-17566Network attack vector

Authenticated command execution via backslash-escape mismatch

Published Jul 31, 2026 · Updated Jul 31, 2026

OS command injection in pgAdmin 4 before 9.18 allows remote authenticated users to execute arbitrary commands through Import/Export Data. The _is_query_parens_balanced() guard treats backslash-quote as an escape, while psql's default parser closes the quote and accepts an injected TO PROGRAM clause. Ordinary Import/Export Data permission is sufficient, and commands run as the pgAdmin service account without further user interaction.

CVSS severity9.9
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in pgAdmin 4 before 9.18 allows remote authenticated users to execute arbitrary commands through Import/Export Data. The _is_query_parens_balanced() guard treats backslash-quote as an escape, while psql's default parser closes the quote and accepts an injected TO PROGRAM clause. Ordinary Import/Export Data permission is sufficient, and commands run as the pgAdmin service account without further user interaction.

The record

CVE
CVE-2026-17566
Published
Jul 31, 2026
Updated
Jul 31, 2026
Vendor
pgAdmin Development Team
Product
pgAdmin 4
Classifications
CWE-115, CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <9.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

pgAdmin Development Team · pgAdmin 4version=0 <9.18

Published CVSS scores

9.9PostgreSQLCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.4PostgreSQLCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-115Misinterpretation of Input
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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