6.5

CVE-2026-72687: elastic elasticsearch

CVSS: 6.5v3.1MediumAnalyzed
AliasesCGA-326j-xj9x-cqw5CGA-34mr-4f7x-gpmpCGA-5mhr-qprv-558c
Published 13-08-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-72687 is a medium (CVSS 6.5) vulnerability in elastic elasticsearch. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 35.2% 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 · +0.12 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-F6FP-67FF-2FHG

Timeline

  1. 13-08-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single small request containing a forged opaque identifier. Elasticsearch decodes and deserializes the identifier before confirming that it was legitimately issued by the cluster, and a size value carried inside the identifier drives an allocation that is neither capped nor accounted for by the available memory-usage controls. The resulting out-of-memory condition is fatal and terminates the affected node process, resulting in a denial of service.

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

+0.12 pp

From 0.30% on 21-09-2026

21-09-202621-10-2026
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-9.2All versions (No fix recorded)
  • elasticsearch-9.3All versions (No fix recorded)
  • ruby3.2-elasticsearchAll versions (No fix recorded)
  • ruby3.3-elasticsearchAll versions (No fix recorded)
  • ruby3.4-elasticsearchAll versions (No fix recorded)
Wolfi4 products
  • ruby3.2-elasticsearchAll versions (No fix recorded)
  • ruby3.3-elasticsearchAll versions (No fix recorded)
  • ruby3.4-elasticsearchAll versions (No fix recorded)
  • ruby4.0-elasticsearchAll versions (No fix recorded)
Elastic1 product
  • elasticsearch≥ 8.0.0, ≤ 8.19.19 | ≥ 9.0.0, ≤ 9.4.4 | 9.5.0 | ≥ 8.0.0, < 8.19.20 | ≥ 9.0.0, < 9.4.5 | ≥ 9.5.0, < 9.5.1

3 vendors · 11 products

References

3 links