CVE-2026-41889

### Impact SQL Injection can occur when: 1. The non-default simple protocol is used. 2. A dollar quoted string literal is used in the SQL query. 3. That string literal contains text that would be would be interpreted as a placeholder outside of a string literal. 4. The value of that placeholder is controllable by the attacker. e.g. ```go attackValue := `$tag$; drop table canary; --` _, err = tx.Exec(ctx, `select $tag$ $1 $tag$, $1`, pgx.QueryExecModeSimpleProtocol, attackValue) ``` This is unlikely to occur outside of a contrived scenario. ### Patches The problem is resolved in v5.9.2. ### Workarounds Do not use the simple protocol to execute queries matching all the above conditions.

SQL Injection can occur when using the non-default simple protocol with a dollar quoted string literal in the SQL query. If that string literal contains text that would be interpreted as a placeholder outside of a string literal, and the value of that placeholder is controllable by the attacker, an injection may be possible. For example, an attacker could provide a value that includes a closing dollar quote followed by malicious SQL commands. This is unlikely to occur outside of a contrived scenario.