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Medium, CVSS 5.7

Elasticsearch: Insertion of Sensitive Information into Log File via reindex API

CVE-2025-37727GHSA-56r7-h6mw-rcfv

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.elasticsearch.plugin:reindex-client 9.1.5, 9.0.8, 8.19.5, 8.18.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-56r7-h6mw-rcfv lists affected ranges: Maven org.elasticsearch.plugin:reindex-client >=7.0.0 =8.19.0 =9.0.0-beta1 =9.1.0 <9.1.5

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.7 · CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS
  • CVE-2025-37727: 0.25% estimated exploitation activity in the next 30 days; percentile 16.84 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Insertion of sensitive information in log file in Elasticsearch can lead to loss of confidentiality under specific preconditions when auditing requests to the reindex API https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-reindex

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-56r7-h6mw-rcfv

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-37727

Advisory: Elasticsearch: Insertion of Sensitive Information into Log File via reindex API
IDs: CVE-2025-37727, GHSA-56r7-h6mw-rcfv
Record: https://patchnext.com/advisories/cve-2025-37727 (revision 1, source checked 26 Oct 2026, 16:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.elasticsearch.plugin:reindex-client 9.1.5, 9.0.8, 8.19.5, 8.18.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.elasticsearch.plugin:reindex-client: affected >= 7.0.0, < 8.18.8; >= 8.19.0, < 8.19.5; >= 9.0.0-beta1, < 9.0.8; >= 9.1.0, < 9.1.5; fixed in 9.1.5, 8.18.8, 9.0.8, 8.19.5

## Suggested inspection (read-only)
- Maven org.elasticsearch.plugin:reindex-client: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.elasticsearch.plugin:reindex-client.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-56r7-h6mw-rcfv (GitHub-reviewed advisory GHSA-56r7-h6mw-rcfv lists affected ranges: Maven org.elasticsearch.plugin:reindex-client >=7.0.0 =8.19.0 =9.0.0-beta1 =9.1.0 <9.1.5)

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