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CVE-2026-63263

31
FAUCET Score

Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Exponential Data Expansion (CAPEC-197). An authenticated user may submit a specially crafted query to the ES|QL engine that causes exponential CPU consumption during query evaluation. Because the resource exhaustion persists beyond query completion, repeated requests can fully exhaust the available query worker resources, rendering ES|QL queries unavailable until the node is restarted.

First published: Jul 21, 2026Last modified: Jul 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.0.0, <= 8.19.18CPE match
cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*
>= 9.0.0, <= 9.3.7CPE match
cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*
>= 9.4.0, <= 9.4.3CPE match
cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.24%
Probability of exploitation in next 30 days
EPSS Percentile
14.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0024 is in the 16th percentile among its peer group of 21,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

microsoft2026-Jul/CVE-2026-63263Moderate

Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service

Jul 14, 2026

References

discuss.elastic.co / t/elasticsearch-8-19-19-9-3-8-9-4-4-security-update-esa-2026-74/388577