4.3

CVE-2026-102408: elastic elasticsearch

CVSS: 4.3v3.1MediumAnalyzed
AliasesCGA-58jr-4889-5wrfCGA-5w5v-x6pr-65wjCGA-f3c2-29rc-g547
Published 06-10-2026Last modified 06-10-2026
Open JSON

Vulnerability summary

CVE-2026-102408 is a medium (CVSS 4.3) vulnerability in elastic elasticsearch. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 26.9% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.35%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 06-10-2026
    PublishedVulnerability first disclosed.
  2. 06-10-2026
    Last modifiedVulnerability information updated.

Description

Inefficient Regular Expression Complexity (CWE-1333) in Elasticsearch can lead to denial of service via Regular Expression Exponential Blowup (CAPEC-492). The ES|QL CHUNK function's recursive chunking strategy accepts a list of user-supplied regular expressions used as text-splitting separators, without validating their computational complexity or bounding their execution time. An authenticated user with read access to any text-based index can submit a specially crafted regular expression that triggers catastrophic backtracking, consuming excessive CPU on Elasticsearch worker threads and degrading query throughput for other tenants on the affected node. The cluster does not crash as a result of this issue.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

07-10-202621-10-2026
EPSS score
0.35%

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

Chainguard5 products
  • elasticsearch-9.2All versions (No fix recorded)
  • elasticsearch-9.3All 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)
Wolfi3 products
  • ruby3.3-elasticsearchAll versions (No fix recorded)
  • ruby3.4-elasticsearchAll versions (No fix recorded)
  • ruby4.0-elasticsearchAll versions (No fix recorded)
Elastic1 product
  • elasticsearch≥ 8.19.0, ≤ 8.19.21 | ≥ 9.1.0, ≤ 9.3.8 | ≥ 9.4.0, ≤ 9.4.7 | ≥ 9.5.0, ≤ 9.5.4 | ≥ 8.19.0, < 8.19.22 | ≥ 9.1.0, < 9.4.8 | ≥ 9.5.0, < 9.5.5

3 vendors · 9 products

References

1 links