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CVE-2026-6637 is a vulnerability in PostgreSQL's contrib/spi refint module, specifically in the check_foreign_key() trigger logic used for referential-integrity helper behavior. The flaw combines two distinct issues: a stack buffer overflow caused by construction of SQL statements in a fixed-length stack buffer, and an SQL injection condition caused by insufficiently safe quoting of key values during cascade update processing. The buffer overflow can be triggered by attacker-controlled long values or metadata involved in dynamically built queries, allowing memory corruption in the PostgreSQL server process. Separately, when an application uses a user-controlled column as a refint cascade primary key and permits attacker-influenced updates to that column, crafted input can be interpolated into generated SQL and executed with the privileges of the database user performing the update. Affected versions are PostgreSQL releases before 18.4, 17.10, 16.14, 15.18, and 14.23.
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A vulnerability in PostgreSQL addressed indirectly through upgraded third-party components in Tenable Security Center.
A PostgreSQL vulnerability affecting contrib/spi, described as involving prevention of SQL injection and buffer overruns.
A critical vulnerability in PostgreSQL's refint module involving a stack buffer overflow that can allow arbitrary code execution as the PostgreSQL OS account, and in a separate scenario can trigger SQL injection via crafted primary key updates.
A PostgreSQL contrib/spi vulnerability combining SQL injection and buffer overrun risks in check_foreign_key() due to improper quoting and fixed-length query buffers.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.