OpenSearch DoS via query_string Before v3.2
CVE-2025-9624 Published on November 25, 2025
OpenSearch 3.2.0 - Nested Boolean/Disjunction asymmetric DoS
A vulnerability in OpenSearch allows attackers to cause Denial of Service (DoS) by submitting complex query_string inputs.
This issue affects all OpenSearch versions between 3.0.0 and < 3.3.0 and OpenSearch < 2.19.4.
Vulnerability Analysis
CVE-2025-9624 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2025-9624. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Stack Exhaustion Vulnerability?
The product does not properly control the amount of recursion which takes place, consuming excessive resources, such as allocated memory or the program stack.
CVE-2025-9624 has been classified to as a Stack Exhaustion vulnerability or weakness.
Products Associated with CVE-2025-9624
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Affected Versions
OpenSearch:- Version 3.0.0 and below 3.3.0 is affected.
- Version 1.0.0 and below 2.19.4 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.