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Subject: BUG #19740: `has_language_privilege` returns TRUE for a nonexistent
 language OID when the user is a superuser
To: pgsql-bugs@lists.postgresql.org
From: PG Bug reporting form <noreply@postgresql.org>
Cc: theshallow27@gmail.com
Reply-To: theshallow27@gmail.com, pgsql-bugs@lists.postgresql.org
Date: Fri, 02 Oct 2026 22:38:00 +0000
Message-ID: <19740-677922f8a0cc921c@postgresql.org>
Auto-Submitted: auto-generated
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 <https://www.postgresql.org/message-id/19740-677922f8a0cc921c%40postgresql.org>
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The following bug has been logged on the website:

Bug reference:      19740
Logged by:          Shallow
Email address:      theshallow27@gmail.com
PostgreSQL version: 18.6
Operating system:   Linux
Description:       =20

For a nonexistent language OID, the implicit-current-user form returns TRUE
when the current user is a superuser. An explicit non-superuser role returns
NULL for the same missing OID. This makes the result depend on the role's
superuser status even though the referenced language does not exist.

**Reproduction:** Run as the default `postgres` superuser:

```sql
SELECT NOT EXISTS (SELECT FROM pg_language WHERE oid =3D 0),
       has_language_privilege(0::oid, 'USAGE'),
       has_language_privilege('pg_monitor', 0::oid, 'USAGE');
```

**Actual result:** `true | true | NULL`.

**Expected result:** The privilege inquiry should return NULL for the
missing
language OID in both forms, matching the function's missing-object handling
for non-superuser roles.