Quick answers
- Is CVE-2026-88406 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-88406 being exploited in the wild.
- How severe is CVE-2026-88406?
- High severity, with a CVSS score of 7.5, published 21 September 2026.
- Which products and versions are affected?
- FalkorDB 4.20.1 to 4.20.4.
- Is there a fix for CVE-2026-88406?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-88406 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-88406?
- Check whether you run FalkorDB 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.
Technical details
The _ValidateUnion_Clauses function in ast_validations.c declares a variable-length array (VLA) on the stack sized directly by the untrusted projection count from the parsed GRAPH.QUERY command, with no upper limit enforced. An attacker with valid authentication and GRAPH.QUERY permission can craft a query with millions of projections to exhaust the thread stack, triggering SIGSEGV and process termination.
Affected products
- FalkorDB FalkorDB 4.20.1 to 4.20.4
Timeline
- 2026-08-05: disclosed: Reported to security@falkordb.com by external researcher
- 2026-09-21: advisory