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CVE-2026-17566 is an OS command injection vulnerability in pgAdmin 4's Import/Export Data functionality. The affected code interpolates a user-supplied SQL query into a psql \copy command and supplies the rendered command to psql using its command-line execution option. Its custom parenthesis-balance validation incorrectly treats a backslash preceding a single quote as an escape sequence. With PostgreSQL's default standard_conforming_strings setting enabled, psql treats that backslash as an ordinary character, allowing a crafted query to terminate a string literal and the intended \copy subquery wrapper. An attacker can thereby inject a psql TO PROGRAM clause, which psql executes through popen(). The issue affects versions from introduction of the custom parenthesis validator through versions earlier than 9.18.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a small standalone Python proof-of-concept for authenticated remote code execution against pgAdmin 4 via CVE-2026-17566. The repo contains three files: an MIT LICENSE, a README describing the vulnerability and usage, and a single executable Python script, pgadmin4_rce_poc.py, which is the clear entry point. The exploit is not part of a larger framework. It uses Python standard-library networking only: urllib for HTTP(S), cookiejar for session handling, ssl for optional certificate verification bypass, regex for CSRF token extraction, and json for request construction. The script implements a complete attack flow: authenticate to pgAdmin, retrieve a CSRF token from GET /login, submit credentials to POST /login, enumerate accessible server objects via GET /browser/servers, then send a crafted JSON request to POST /import_export/job/<sid>. Its core capability is command execution on the host running pgAdmin. The malicious query is built by build_query(), which returns a payload of the form SELECT 'a\') TO PROGRAM '%s' x'. This is designed to exploit a parsing mismatch between pgAdmin's parenthesis checker and psql string handling, causing the injected TO PROGRAM clause to become active. The operator can supply an arbitrary command with --command or request an automatically generated bash reverse shell with --reverse HOST:PORT. Default demonstration behavior writes command output to /tmp/pgadmin_rce_proof, and the export job uses /tmp/pgadmin_export.csv as the nominal output file. Operationally, this is more than a detector: it performs authentication, target enumeration, payload generation, and exploit delivery. However, it is still a PoC-style standalone script rather than a weaponized framework module. The README also notes the code was based on public analysis and may require minor field adjustments depending on exact pgAdmin version behavior.
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CVE-2026-17566 is referenced in connection with pgAdmin 4 container images/tags 9.16 and 9.17 and the /login endpoint. The content does not describe the vulnerability type, impact, affected-version range, or remediation.
A remote code execution vulnerability in pgAdmin 4's Import/Export Data feature caused by improper validation of a user-supplied SQL query embedded into a psql \copy command. A mismatch between pgAdmin's quote/parenthesis checker and PostgreSQL/psql string handling allows injection of a TO PROGRAM clause that can execute attacker-controlled commands via popen().
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