Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB
Summary
| CVE | CVE-2026-7826 |
|---|---|
| State | PUBLISHED |
| Assigner | securin |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-09 05:16:45 UTC |
| Updated | 2026-10-09 05:16:45 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 8.8 HIGH from 33c584b5-0579-4c06-b2a0-8d8329fcab9c
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 33c584b5-0579-4c06-b2a0-8d8329fcab9c | Secondary | 8.8 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 8.8 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N |
| 3.1 | 33c584b5-0579-4c06-b2a0-8d8329fcab9c | Secondary | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| 3.1 | CNA | CVSS | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/FalkorDB/FalkorDB/commit/55d986f45ecd5d80f7a9e5e138e8b0f96535... | 33c584b5-0579-4c06-b2a0-8d8329fcab9c | github.com | |
| github.com/FalkorDB/FalkorDB/pull/1972 | 33c584b5-0579-4c06-b2a0-8d8329fcab9c | github.com | |
| github.com/FalkorDB/FalkorDB/releases/tag/v4.18.4 | 33c584b5-0579-4c06-b2a0-8d8329fcab9c | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Arjun Basnet from Securin (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-04-24T00:00:00.000Z | Reported to FalkorDB |
| CNA | 2026-05-05T00:00:00.000Z | CVE ID shared with the vendor |
| CNA | 2026-05-07T00:00:00.000Z | Fix merged by the vendor (PR #1972) |
| CNA | 2026-05-07T00:00:00.000Z | FalkorDB 4.18.4 released with the fix |
Solutions
CNA: Upgrade FalkorDB to version 4.18.4 or later.
Workarounds
CNA: Require authentication on the Redis/FalkorDB instance (requirepass or ACLs), restrict or rename the REPLICAOF/SLAVEOF commands so untrusted clients cannot use them, and do not expose the instance to untrusted networks.