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    <lastBuildDate>Wed, 07 Oct 2026 01:48:37 +0000</lastBuildDate>
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      <title>CVE-2026-17566 — pgAdmin 4: RCE via backslash-escape mismatch in Import/Export Data query guard (incomplete defense, sibling gap to CVE-…</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-17566</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; pgadmin.org pgAdmin 4&lt;/p&gt;
&lt;p&gt;pgAdmin 4&amp;#39;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/&amp;lt;sid&amp;gt;, 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 (\&amp;#39;) 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&amp;#39;s own \copy tokenizer treats \ as an ordinary character, so a single quote immediately after it closes the string literal. A query such as SELECT &amp;#39;a\&amp;#39;) TO PROGRAM &amp;#39;echo pwned&amp;#39; x&amp;#39; was therefore accepted as &amp;#34;balanced&amp;#34; by pgAdmin&amp;#39;s checker (which believed the ) was still inside the string), while psql, run through the actual rendered command line, closes the string at that point and treats the following ) as the end of the wrapping \copy (...) subquery, exposing an attacker-chosen TO PROGRAM &amp;#39;&amp;lt;command&amp;gt;&amp;#39; clause that psql executes via popen() -- independent of a subsequent syntax error later on the same line. This is the same class of bug as CVE-2025-12762/CVE-2025-13780 (RCE via…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; pgadmin.org pgAdmin 4&lt;/p&gt;
&lt;p&gt;pgAdmin 4&amp;#39;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/&amp;lt;sid&amp;gt;, 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 (\&amp;#39;) 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&amp;#39;s own \copy tokenizer treats \ as an ordinary character, so a single quote immediately after it closes the string literal. A query such as SELECT &amp;#39;a\&amp;#39;) TO PROGRAM &amp;#39;echo pwned&amp;#39; x&amp;#39; was therefore accepted as &amp;#34;balanced&amp;#34; by pgAdmin&amp;#39;s checker (which believed the ) was still inside the string), while psql, run through the actual rendered command line, closes the string at that point and treats the following ) as the end of the wrapping \copy (...) subquery, exposing an attacker-chosen TO PROGRAM &amp;#39;&amp;lt;command&amp;gt;&amp;#39; clause that psql executes via popen() -- independent of a subsequent syntax error later on the same line. This is the same class of bug as CVE-2025-12762/CVE-2025-13780 (RCE via…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-17566</guid>
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