CVE-2026-88408Network attack vector

Authenticated service crash via unbounded query keys

Published Sep 21, 2026 · Updated Sep 21, 2026

Stack exhaustion in FalkorDB 4.20.1 through 4.20.4 allows remote authenticated users to crash the server with a crafted graph query. The _GetGroup() function in src/execution_plan/ops/op_aggregate.c allocates a variable-length stack array from the unbounded number of key expressions in the query's RETURN clause. A connection permitted to run GRAPH.QUERY is required; exhausting the process stack triggers SIGSEGV, terminates the server, and loses non-persisted graph data.

CVSS severity6.5
Medium
EPSS probability0.41%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack exhaustion in FalkorDB 4.20.1 through 4.20.4 allows remote authenticated users to crash the server with a crafted graph query. The _GetGroup() function in src/execution_plan/ops/op_aggregate.c allocates a variable-length stack array from the unbounded number of key expressions in the query's RETURN clause. A connection permitted to run GRAPH.QUERY is required; exhausting the process stack triggers SIGSEGV, terminates the server, and loses non-persisted graph data.

The record

CVE
CVE-2026-88408
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

6.5MITRECVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:L/S:U/UI:N

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.

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Technologies

Your stack

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Your stack

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