---
title: "CVE-2026-88409: FalkorDB Redis module - Buffer Overflow"
description: "FalkorDB Redis module v4.20.1 to v4.20.4 contains a buffer overflow caused by improper handling in _Decode_GrB_Matrix function, letting attackers cause denial of service via crafted input, exploit requires no special privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-88409/
---

# CVE-2026-88409 FalkorDB Redis module - Buffer Overflow

FalkorDB Redis module v4.20.1 to v4.20.4 contains a buffer overflow caused by improper handling in \_Decode\_GrB\_Matrix function, letting attackers cause denial of service via crafted input, exploit requires no special privileges.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.48% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-88409)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

21 September 2026

Updated

15 October 2026

Weakness

[CWE-120](https://cwe.mitre.org/data/definitions/120.html)

## Vendor fix

Update to a version later than v4.20.4 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-88409](https://nvd.nist.gov/vuln/detail/CVE-2026-88409)
- [https://github.com/FalkorDB/FalkorDB/issues/2399](https://github.com/FalkorDB/FalkorDB/issues/2399)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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