How severe is CVE-2026-1605?

CVE-2026-1605 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-1605?

CVE-2026-1605 affects the following packages: org.eclipse.jetty:jetty-server (Maven), org.eclipse.jetty:jetty-server (Maven). Ecosystems affected: Maven.

How do I fix CVE-2026-1605?

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.

How do I detect CVE-2026-1605 in my Maven dependencies?

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.

How do I mitigate CVE-2026-1605 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2026-1605?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-1605 can be triaged on real exposure rather than presence alone.

Is CVE-2026-1605 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-1605 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-1605?

CVE-2026-1605 has an EPSS (Exploit Prediction Scoring System) score of 0.7%, placing it in the 50th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-1605?

CVE-2026-1605 is classified as Uncontrolled Resource Consumption (CWE-400), CWE-401 (CWE-401), CWE-772 (CWE-772). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-1605 published, and has it been updated?

CVE-2026-1605 was published on March 5, 2026 and was last updated on September 15, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

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

Mar 5, 2026

Updated

Sep 15, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Sep 20, 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 CVEs50th percentile — riskier than 50% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

How urgent is this, really

CVE-2026-1605 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.

Where this sits among everything scored

Of 377,238 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.

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

This happens because the JDK Inflater is allocated for decompressing the request, but it is not released because the release mechanism is tied to the compressed response. In this case, since the response is not compressed, the release mechanism does not trigger, causing the leak.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.eclipse.jetty:jetty-server`	≥ 12.1.0&&< 12.1.6	12.1.6`org.eclipse.jetty:jetty-server:12.1.6`
☕Maven	`org.eclipse.jetty:jetty-server`	≥ 12.0.0&&< 12.0.32	12.0.32`org.eclipse.jetty:jetty-server:12.0.32`

Detection & mitigation playbook

Open-source dependency

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.
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.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-1605 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-1605. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

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.

Product	Fixed in	Advisory
HawtIO HawtIO 4.4.0	`jetty-server`	RHSA-2026:25089
Red Hat AMQ Broker 7.14.0	`jetty-server`	RHSA-2026:8509
Red Hat JBoss Enterprise Application Platform 8.1	`jetty-server`	RHSA-2026:25126
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	`eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el8eap`	RHSA-2026:25125
OpenShift Developer Tools and Services 4.12	`ocp-tools-4/jenkins-rhel8:1786628667`	RHSA-2026:60247
OpenShift Developer Tools and Services 4.13	`ocp-tools-4/jenkins-rhel8:1786628681`	RHSA-2026:60249
OpenShift Developer Tools and Services 4.14	`ocp-tools-4/jenkins-rhel8:1786533561`	RHSA-2026:60248
OpenShift Developer Tools and Services 4.15	`ocp-tools-4/jenkins-rhel8:1786533565`	RHSA-2026:60239

Frequently Asked Questions

In Eclipse Jetty, versions 12.0.0-12.0.31 and 12.1.0-12.0.5, class GzipHandler exposes a vulnerability when a compressed HTTP request, with Content-Encoding: gzip, is processed and the corresponding response is not compressed. This happens because the JDK Inflater is allocated for decompressing the request, but it is not released because the release mechanism is tied to the compressed response. In this case, since the response is not compressed, the release mechanism does not trigger, causing the leak.

O3 Security · Impact-Aware SCA

Is CVE-2026-1605 in your dependencies?

O3 Security finds CVE-2026-1605 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works