6.5

CVE-2026-63144: elastic elasticsearch Uncontrolled Recursion

CVSS: 6.5v3.1MediumAnalyzed
AliasesCGA-5qf7-495x-h225CGA-62mg-gj4g-q6m8CGA-64v8-6c6p-96qw
Published 21-07-2026Last modified 22-07-2026
Open JSON

Vulnerability summary

CVE-2026-63144 is a medium (CVSS 6.5) Uncontrolled Recursion vulnerability in elastic elasticsearch. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 34.9% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.42%
0%100%
Low · +0.18 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-FFM9-6X96-C2FC

Timeline

  1. 21-07-2026
    PublishedVulnerability first disclosed.
  2. 22-07-2026
    Last modifiedVulnerability information updated.

Description

Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via a specially crafted search request submitted by a low-privileged authenticated user. A user with read-level index access can submit a request that triggers unbounded recursive processing within the Elasticsearch query evaluation component, causing a fatal error that terminates the affected node. In single-node deployments, this results in complete service outage; in multi-node clusters, it causes repeated node restarts and sustained availability degradation.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

+0.18 pp

From 0.24% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.42%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard6 products
  • elasticsearch-9.1All versions (No fix recorded)
  • elasticsearch-9.2All versions (No fix recorded)
  • ruby3.2-elasticsearch< 9.5.0-r0
  • ruby3.3-elasticsearch< 9.5.0-r0
  • ruby3.4-elasticsearch< 9.5.0-r1 | < 9.5.0-r0
Wolfi4 products
  • ruby3.2-elasticsearch< 9.5.0-r0
  • ruby3.3-elasticsearch< 9.5.0-r0
  • ruby3.4-elasticsearch< 9.5.0-r1 | < 9.5.0-r0
  • ruby4.0-elasticsearch< 9.5.0-r0
Elastic1 product
  • elasticsearch≥ 9.4.0, ≤ 9.4.3 | ≥ 9.3.0, ≤ 9.3.7 | ≥ 8.19.0, ≤ 8.19.18 | ≥ 8.19.0, < 8.19.19 | ≥ 9.3.0, < 9.3.8 | ≥ 9.4.0, < 9.4.4

3 vendors · 11 products

References

3 links