Critical [CVE-2026-17566] pgAdmin 4: pgAdmin 4: Remote Code Execution via backslash-escape mismatch in Import/Export Data tool
This critical-severity Red Hat Linux advisory covers CVE-2026-17566.
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Summary
pgAdmin 4's Import/Export Data tool builds a psql \copy (...) command line by interpolating a user-supplied SQL query into a Jinja template and passing the rendered line to psql via --command.
To stop an attacker from breaking out of the (...) wrapper, create_import_export_job() (route POST /import_export/job/, gated only by the ordinary, commonly-granted tools_import_export_data permission) validated the query with a hand-written parenthesis-balance checker, _is_query_parens_balanced().
That checker always treated a backslash before a single quote (\') as escaping the quote, i.e. as if standard_conforming_strings were off.
PostgreSQL has defaulted standard_conforming_strings to on since 9.1 (2010), the default on every PostgreSQL version pgAdmin 4 currently supports (13-18); under that default psql's own \copy tokenizer treats \ as an ordinary character, so a single quote immediately after it closes the string literal.
- < 9.18
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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