CVE-2026-63140 Details
Reachable Assertion (CWE-617) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153). A specially crafted search request containing a null value in a specific query clause causes an internal assertion to be raised during query parsing. Because Elasticsearch treats assertion failures as fatal errors, this terminates the affected node process. A low-privileged authenticated user with read access to at least one index can exploit this condition with a single request to cause a node to terminate, disrupting search availability. In a single-node deployment this fully stops Elasticsearch; in a multi-node cluster it reduces cluster capacity for each affected node.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-63140
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%).
0.24 Probability of exploitation activity being observed over the next 30 days (15th percentile)
CVSS score for CVE-2026-63140
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-2026-63140
Elasticsearch 8.3.2
Elasticsearch 8.3.3
Elasticsearch 8.3.3
Elasticsearch 8.4.0
Elasticsearch 8.4.0
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-2026-63140 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
CN 97 22.88%
US 61 14.39%
DE 45 10.61%
MX 30 7.08%
KR 17 4.01%
VN 17 4.01%
IN 16 3.77%
RU 16 3.77%
BR 13 3.07%
NL 13 3.07%

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CVE-2026-63140 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 242 88.97%
Telecommunications 20 7.35%
Education 3 1.10%
Media/Entertainment 2 0.74%
Government/Politics 2 0.74%
Retail 1 0.37%
Utilities 1 0.37%
Aerospace/Defense 1 0.37%

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