CVE-2026-72639 Details
Elasticsearch does not enforce an upper bound on a user-supplied count accepted by a search highlighting option, and the allocation derived from that count is not accounted against any circuit breaker. An authenticated user holding only read privileges on a single searchable index can submit one small search request that causes the node to reserve an excessively large internal data structure. The allocation occurs before the existing highlighting safety limits are evaluated, so memory exhaustion raises a fatal error that terminates the Elasticsearch node process. This results in a denial of service for the affected node and degrades cluster routing and health. The defect is not volumetric and does not depend on the size of the indexed data, so a single request is sufficient.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-72639
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.3 Probability of exploitation activity being observed over the next 30 days (22nd percentile)
CVSS score for CVE-2026-72639
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
6.5 Medium
Products affected by CVE-2026-72639
Elasticsearch 9.3.7
Elasticsearch 9.3.8
Elasticsearch 9.3.8
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-72639 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
CN 25 22.12%
US 16 14.16%
BR 15 13.27%
DE 12 10.62%
FR 11 9.73%
IN 4 3.54%
DK 2 1.77%
VN 2 1.77%
GB 2 1.77%
HK 2 1.77%

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CVE-2026-72639 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 64 85.33%
Telecommunications 7 9.33%
Education 2 2.67%
Government/Politics 1 1.33%
Retail 1 1.33%

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