---
id: CVE-2026-7826
title: >-
  A heap-based out-of-bounds read in the BufferSerializerIOv2_ReadBuffer
  function (src/serializers/serializer_io.c) in FalkorDB before 4.18.4 allows a
  remote attacker who can issue Redis replication commands (for example, against
  an instan…
summary: >-
  A heap-based out-of-bounds read in the BufferSerializerIOv2_ReadBuffer
  function (src/serializers/serializer_io.c) in FalkorDB before 4.18.4 allows a
  remote attacker who can issue Redis replication commands (for example, against
  an instan…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-125
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T05:16:45.270'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-7826'
references:
  - url: >-
      https://github.com/FalkorDB/FalkorDB/commit/55d986f45ecd5d80f7a9e5e138e8b0f96535b48c
    label: 33c584b5-0579-4c06-b2a0-8d8329fcab9c
  - url: 'https://github.com/FalkorDB/FalkorDB/pull/1972'
    label: 33c584b5-0579-4c06-b2a0-8d8329fcab9c
  - url: 'https://github.com/FalkorDB/FalkorDB/releases/tag/v4.18.4'
    label: 33c584b5-0579-4c06-b2a0-8d8329fcab9c
tags:
  - nvd
ingestedAt: '2026-10-09T05:26:07.006Z'
---

## Overview

A heap-based out-of-bounds read in the BufferSerializerIOv2_ReadBuffer function (src/serializers/serializer_io.c) in FalkorDB before 4.18.4 allows a remote attacker who can issue Redis replication commands (for example, against an instance with no password configured) to cause a denial of service or disclose heap memory by supplying a crafted RDB stream whose sub-buffer length field exceeds the remaining buffer size. The only bounds check is an ASSERT(), which is compiled out in release builds, so memcpy() reads past the end of the heap allocation.

## Remediation

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