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CVE-2026-46373 — SQLFluff: Recursive Stack Overflow in Parser

Affected: sqlfluff

SQLFluff is a modular SQL linter and auto-formatter with support for multiple dialects and templated code. Prior to version 4.1.0, in deployments where untrusted users can provide SQL queries to be linted, an untrusted user can submit a malicious query with deliberate excessive nesting to any application using the parser to trigger a Denial of Service through resource exhaustion. This issue has been patched in version 4.1.0.

GHSA-wmhf-fqc8-vxhh — SQLFluff: Recursive Stack Overflow in Parser

Affected: PyPI: sqlfluff

### Impact

In deployments where untrusted users can provide SQL queries to be linted, an untrusted user can submit a malicious query with deliberate excessive nesting to any application using the parser to trigger a Denial of Service through resource exhaustion.

### Patches

Versions 4.1.0 and up contain a configurable recursion limit, which is enabled by default, to prevent this manner of exploit.

### Credit

Ori Nakar from Imperva Threat Research Team.

PYSEC-2026-209

Affected: PyPI: sqlfluff