CVE-2025-9624Public exploitNetwork attack vector

Node termination via unbounded query-tree expansion

Published Nov 25, 2025 · Updated Dec 15, 2025

Uncontrolled recursion in OpenSearch before 2.19.4 and 3.0.0 through 3.2.0 allows remote authenticated users to crash nodes via query_string. The parser limits clauses per BooleanQuery but not total nodes, so nested Boolean and DisjunctionMaxQuery expansion consumes CPU and heap. Reachability requires permission to submit search queries; one crafted request can terminate the process through memory exhaustion.

CVSS severity7.5
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in OpenSearch before 2.19.4 and 3.0.0 through 3.2.0 allows remote authenticated users to crash nodes via query_string. The parser limits clauses per BooleanQuery but not total nodes, so nested Boolean and DisjunctionMaxQuery expansion consumes CPU and heap. Reachability requires permission to submit search queries; one crafted request can terminate the process through memory exhaustion.

The record

CVE
CVE-2025-9624
Published
Nov 25, 2025
Updated
Dec 15, 2025
Vendor
OpenSearch Software Foundation
Product
OpenSearch
Classifications
CWE-674, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <2.19.4
  2. Affected versionversion=3.0.0 <3.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenSearch Software Foundation · OpenSearchversion=1.0.0 <2.19.4; version=3.0.0 <3.3.0

Published CVSS scores

8.3Fluid AttacksCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation Flood

Public exploit references

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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