# CVE-2026-46373: SQLFluff uncontrolled recursion in parser causes Denial of Service

Source: https://junglewise.ai/threats/cve-2026-46373-sqlfluff-uncontrolled-recursion-in-parser-causes-denial-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-46373 · Severity: high · CVSS 7.5 · Published 2026-06-09

SQLFluff is a tool used by developers to automatically check and format SQL database code. A vulnerability in the way it processes complex code allows an attacker to submit a specially crafted, deeply nested SQL query that crashes the application. This results in a denial-of-service, potentially disrupting automated development pipelines or web services that integrate SQLFluff for user-provided queries.

Technologies: [sqlfluff (PyPI)](https://junglewise.ai/threats/technologies/sqlfluff). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-46373 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-46373 being exploited in the wild.

**How severe is CVE-2026-46373?** High severity, with a CVSS score of 7.5, published 9 June 2026.

**Which products and versions are affected?** sqlfluff (PyPI) < 4.1.0, ECOSYSTEM:introduced=0,fixed=4.1.0.

**Is there a fix for CVE-2026-46373?** Yes. sqlfluff (PyPI): upgrade to 4.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-46373 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-46373?** Check whether you run sqlfluff (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- sqlfluff (PyPI): upgrade to 4.1.0 or later

  ```sh
  pip install "sqlfluff>=4.1.0"
  ```


## Technical details

SQLFluff prior to version 4.1.0 is vulnerable to Uncontrolled Recursion (CWE-674) within its parser component. When processing SQL queries with deliberate, excessive nesting, the parser fails to limit recursion depth, leading to a stack overflow or general resource exhaustion. This can be exploited remotely without authentication if the library is integrated into a service that accepts untrusted SQL input. The vulnerability results in a Denial of Service (DoS) of the parsing process. The issue is resolved in version 4.1.0, which introduces a configurable recursion limit that is enabled by default.

## Affected products

- SQLFluff SQLFluff < 4.1.0

## Identifiers

- CVE-2026-46373
- GHSA-wmhf-fqc8-vxhh
- PYSEC-2026-209

## Timeline

- 2026-05-14: advisory: GitHub Security Advisory published
- 2026-06-09: disclosed: NVD publication date
- 2026-06-09: patched: Version 4.1.0 released with recursion limits

## References

- [https://github.com/sqlfluff/sqlfluff/security/advisories/GHSA-wmhf-fqc8-vxhh](https://github.com/sqlfluff/sqlfluff/security/advisories/GHSA-wmhf-fqc8-vxhh)

## Related threats

- [SQLFluff Denial of Service via resource exhaustion in parser](https://junglewise.ai/threats/cve-2026-46374-sqlfluff-denial-of-service-via-resource-exhaustion-in-parser)
- [SQLFluff users with access to config file, using `libary_path` may call arbitrary python code](https://junglewise.ai/threats/cve-2023-36830-sqlfluff-users-with-access-to-config-file-using-libary-path-may)