CVE-2026-88409Network attack vector

Service crash via crafted matrix decoding

Published Sep 21, 2026 · Updated Sep 21, 2026

Buffer overflow in FalkorDB 4.20.1 through 4.20.4 allows attackers to crash the service via crafted matrix data. _Decode_GrB_Matrix trusts an attacker-controlled buffer length because its size check is an assertion removed from release builds. A short buffer is treated as a GraphBLAS container, causing out-of-bounds pointer writes and process termination; network authentication is required when Redis access controls are enabled.

CVSS severity8.8
High
EPSS probability0.48%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in FalkorDB 4.20.1 through 4.20.4 allows attackers to crash the service via crafted matrix data. _Decode_GrB_Matrix trusts an attacker-controlled buffer length because its size check is an assertion removed from release builds. A short buffer is treated as a GraphBLAS container, causing out-of-bounds pointer writes and process termination; network authentication is required when Redis access controls are enabled.

The record

CVE
CVE-2026-88409
Published
Sep 21, 2026
Updated
Sep 21, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8FalkorDB upstream issueCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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