---
id: CVE-2026-88406
title: >-
  FalkorDB (Redis module) v4.20.1 to v4.20.4 was discovered to contain a stack
  overflow in the _ValidateUnion_Clauses function (/ast/ast_validations.c)
summary: >-
  FalkorDB (Redis module) v4.20.1 to v4.20.4 was discovered to contain a stack
  overflow in the _ValidateUnion_Clauses function (/ast/ast_validations.c). This
  vulnerability allows attackers to cause a Denial of Service (DoS) via a
  crafted i…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-121
published: '2026-09-21'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:00:03.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88406'
references:
  - url: 'https://github.com/FalkorDB/FalkorDB/issues/2329'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00458
epssPercentile: 0.37049
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-22T14:55:12.793984Z'
ingestedAt: '2026-09-21T21:53:57.422Z'
---

## Overview

FalkorDB (Redis module) v4.20.1 to v4.20.4 was discovered to contain a stack overflow in the _ValidateUnion_Clauses function (/ast/ast_validations.c). This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.