CVE-2026-49090 in Elasticsearch
Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to a denial of service via Excessive Allocation (CAPEC-130). An authenticated user can submit a specially crafted bulk request that causes sustained high CPU consumption, which can render the affected node unable to process requests.
Quick answer
Elasticsearch should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Elasticsearch 7.x through 7.17.23
- Elasticsearch 8.x before 8.15.0
Fixed versions
- Elasticsearch 7.17.24 or later
- Elasticsearch 8.15.0 or later
How to fix it
CVE-2026-49090 affects Elasticsearch. In simple terms, the service may slow down, crash, or stop answering. Update to Elasticsearch 7.17.24 or later; Elasticsearch 8.15.0 or later. If you cannot update today, limit who can reach this system until the fix is done.
- Find every place where Elasticsearch is installed or used.
- Check if the version matches: Elasticsearch 7.x through 7.17.23; Elasticsearch 8.x before 8.15.0.
- Update to: Elasticsearch 7.17.24 or later; Elasticsearch 8.15.0 or later.
- If you cannot update now, allow only trusted users and trusted networks.
- Check logs for crashes, strange requests, failed logins, or unexpected access.
- Change secrets or passwords if you think data may have been exposed.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm the installed version is now: Elasticsearch 7.17.24 or later; Elasticsearch 8.15.0 or later.
- Confirm the risky feature is no longer exposed to untrusted users.
- Run the affected workflow again and make sure it still works.
- Review logs again after the update.
- Run a new Fixnx scan if this software is part of a public website.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-49090?
Elasticsearch versions listed as affected should be reviewed: Elasticsearch 7.x through 7.17.23, Elasticsearch 8.x before 8.15.0.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.