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HIGH severity

CVE-2026-1605 — jetty-server

HIGH

CVE-2026-1605 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in org.eclipse.jetty:jetty-server. A fix is available for org.eclipse.jetty:jetty-server — see the affected versions and patch details below.

The Eclipse Jetty Server Artifact has a Gzip request memory leak

Also known asGHSA-xxh7-fcf3-rj7f
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-1605.

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk
0.00%0.41%0.83%1.24%0.1%0.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
☕org.eclipse.jetty:jetty-server☕org.eclipse.jetty:jetty-server

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Description (as reported)

There is a memory leak when using GzipHandler in jetty-12.0.30 that can cause off-heap OOMs. This can be used for DoS attacks so I'm reporting this as a vulnerability.

The leak is created by requests where the request is inflated (Content-Encoding: gzip) and the response is not deflated (no Accept-Encoding: gzip). In these conditions, a new inflator will be created by GzipRequest and never released back into GzipRequest.__inflaterPool because gzipRequest.destory() is not called.

In heap dumps one can see thousands of java.util.zip.Inflator objects, which use both Java heaps and native memory. Leaking native memory causes of off-heap OOMs.

Code path in GzipHandler.handle():

  1. Line 601: GzipRequest is created when request inflation is needed.
  2. Lines 611-616: The callback is only wrapped in GzipResponseAndCallback when both inflation and deflation are needed.
  3. Lines 619-625: If the handler accepts the request (returns true), gzipRequest.destroy() is only called in the "request not accepted" path (returns false)

When deflation is needed, GzipResponseAndCallback (lines 102 and 116) properly calls gzipRequest.destroy() in its succeeded() and failed() methods. But this wrapper is only created when deflation is needed.

Possible fix: The callback should be wrapped whenever a GzipRequest is created, not just when deflation is needed. This ensures gzipRequest.destroy() is always called when the request completes.

Impact

The leak causes the JVM to crash with OOME.

Patches

No patches yet.

Workarounds

Disable GzipHandler.

References

https://github.com/jetty/jetty.project/issues/14260

https://gitlab.eclipse.org/security/cve-assignment/-/issues/79

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.eclipse.jetty:jetty-server≥ 12.1.0&&< 12.1.612.1.6org.eclipse.jetty:jetty-server:12.1.6
☕Mavenorg.eclipse.jetty:jetty-server≥ 12.0.0&&< 12.0.3212.0.32org.eclipse.jetty:jetty-server:12.0.32

Affected Products

1 product · 2 configurations
Application
jettyeclipse
≥ 12.1.0 && < 12.1.6
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.eclipse.jetty:jetty-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.eclipse.jetty:jetty-server to 12.1.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-1605 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

This Important flaw in Eclipse Jetty's GzipHandler can lead to a denial of service in affected Red Hat products. The vulnerability arises when compressed HTTP requests are processed without a corresponding compressed response, causing a resource leak that can exhaust system resources and render the service unavailable.

Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Source: Red Hat security advisory for CVE-2026-1605 (CC BY 4.0)
ProductFixed inAdvisory
HawtIO HawtIO 4.4.0jetty-serverRHSA-2026:25089
Red Hat AMQ Broker 7.14.0jetty-serverRHSA-2026:8509
Red Hat JBoss Enterprise Application Platform 8.1.6org.jboss.activemq.artemis.integration/artemis-wildfly-integration:2.0.3.Final-redhat-00001RHSA-2026:25126
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el8eapRHSA-2026:25125
OpenShift Developer Tools and Services 4.12ocp-tools-4/jenkins-rhel8:1786628667RHSA-2026:60247
OpenShift Developer Tools and Services 4.13ocp-tools-4/jenkins-rhel8:1786628681RHSA-2026:60249
OpenShift Developer Tools and Services 4.14ocp-tools-4/jenkins-rhel8:1786533561RHSA-2026:60248
OpenShift Developer Tools and Services 4.15ocp-tools-4/jenkins-rhel8:1786533565RHSA-2026:60239

Frequently Asked Questions

### Description (as reported) There is a memory leak when using `GzipHandler` in jetty-12.0.30 that can cause off-heap OOMs. This can be used for DoS attacks so I'm reporting this as a vulnerability. The leak is created by requests where the request is inflated (`Content-Encoding: gzip`) and the response is not deflated (no `Accept-Encoding: gzip`). In these conditions, a new inflator will be created by `GzipRequest` and never released back into `GzipRequest.__inflaterPool` because `gzipRequest.destory()` is not called. In heap dumps one can see thousands of `java.util.zip.Inflator` objects
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CVE-2026-1605: jetty-server DoS — Fixed in 12.1.6