Elasticsearch Uncontrolled Recursion CVE-2026-56148 (Denial of Service)
CVE-2026-56148 Published on July 1, 2026
Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to a denial of service via Excessive Allocation (CAPEC-130). An authenticated user can submit a specially crafted query that causes excessive resource consumption while the request is processed, which may render the affected node unavailable.
Vulnerability Analysis
CVE-2026-56148 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on 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-2026-56148 has been classified to as a Stack Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-56148
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Affected Versions
Elasticsearch:- Version 9.4.0, <= 9.4.2 is affected.
- Version 9.0.0, <= 9.3.5 is affected.
- Version 8.0.0, <= 8.19.16 is affected.