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CVE-2026-58225 is an SQL injection flaw in Postgrex notifications handling affecting postgrex versions 0.16.0 before 0.22.3. The issue arises in Postgrex.Notifications when replaying registered LISTEN subscriptions after a connection or reconnection. Channel names are sanitized by quote_channel/1 for use inside double-quoted identifiers, which is sufficient for individual LISTEN and UNLISTEN statements. However, handle_connect/1 rebuilds all subscriptions by concatenating LISTEN statements inside a dollar-quoted anonymous PostgreSQL DO block. Because quote_channel/1 does not escape the dollar-quote delimiter, an attacker-controlled channel name containing the delimiter can terminate the outer quoted block early and corrupt the replay query. The listen/3 validation only rejects null bytes and overlong names, allowing such crafted channel names to pass. The result is not arbitrary SQL execution, but a malformed reconnect replay query that prevents notification subscriptions from being restored.
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