How severe is CVE-2016-7046?

CVE-2016-7046 has a CVSS score of 5.9/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2016-7046?

CVE-2016-7046 affects the following packages: io.undertow:undertow-core (Maven), io.undertow:undertow-core (Maven). Ecosystems affected: Maven.

How do I fix CVE-2016-7046?

Update io.undertow:undertow-core to 1.4.3.Final or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-7046 is resolved across your whole dependency graph.

How do I detect CVE-2016-7046 in my Maven dependencies?

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

How do I mitigate CVE-2016-7046 if there is no patch (or I can't update yet)?

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.

Is CVE-2016-7046 actively exploited in the wild?

No public exploit code has been indexed for CVE-2016-7046 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-2016-7046?

CVE-2016-7046 has an EPSS (Exploit Prediction Scoring System) score of 2.5%, placing it in the 85th 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-2016-7046?

CVE-2016-7046 is classified as CWE-399 (CWE-399). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2016-7046 published, and has it been updated?

CVE-2016-7046 was published on October 3, 2016 and was last updated on March 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

MEDIUM severity

CVE-2016-7046 — undertow-core

MEDIUMFix: undertow-io/undertow@c518b5a

CVE-2016-7046 is a medium-severity (CVSS 5.9) CWE-399 vulnerability in io.undertow:undertow-core. A fix is available for io.undertow:undertow-core — see the affected versions and patch details below.

Undertow Uncaught Exception vulnerability

Also known asGHSA-3f57-w2rp-72fc

Published

Oct 3, 2016

Updated

Mar 15, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs85th percentile — riskier than 85% of all scored CVEsHighest risk

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

☕io.undertow:undertow-core☕io.undertow:undertow-core

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

Red Hat JBoss Enterprise Application Platform (EAP) 7, when operating as a reverse-proxy with default buffer sizes, allows remote attackers to cause a denial of service (CPU and disk consumption) via a long URL.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`io.undertow:undertow-core`	≥ 1.4.0&&< 1.4.3.Final	1.4.3.Final`io.undertow:undertow-core:1.4.3.Final`
☕Maven	`io.undertow:undertow-core`	all versions	1.3.25.Final`io.undertow:undertow-core:1.3.25.Final`

Affected Products

1 product · 1 configurations

Application

jboss enterprise application platformredhat

1 version

7.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.undertow:undertow-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update io.undertow:undertow-core to 1.4.3.Final or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-7046 is resolved across your whole dependency graph.
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

Product	Fixed in	Advisory
Red Hat JBoss EAP 7.0	see advisory	RHSA-2016:2657
Red Hat JBoss EAP 7.1	see advisory	RHSA-2017:3456
Red Hat JBoss Enterprise Application Platform 7.0 for RHEL 6	`eap7-hibernate-0:5.0.11-1.Final_redhat_1.1.ep7.el6`	RHSA-2016:2640
Red Hat JBoss Enterprise Application Platform 7.0 for RHEL 6	`eap7-jboss-ec2-eap-0:7.0.3-3.GA_redhat_2.ep7.el6`	RHSA-2016:2642
Red Hat JBoss Enterprise Application Platform 7.0 for RHEL 7	`eap7-hibernate-0:5.0.11-1.Final_redhat_1.1.ep7.el7`	RHSA-2016:2641
Red Hat JBoss Enterprise Application Platform 7.1 for RHEL 6	`eap7-activemq-artemis-0:1.5.5.008-1.redhat_1.1.ep7.el6`	RHSA-2017:3454
Red Hat JBoss Enterprise Application Platform 7.1 for RHEL 6	`eap7-jboss-ec2-eap-0:7.1.0-5.GA_redhat_5.ep7.el6`	RHSA-2017:3458
Red Hat JBoss Enterprise Application Platform 7.1 for RHEL 7	`eap7-activemq-artemis-0:1.5.5.008-1.redhat_1.1.ep7.el7`	RHSA-2017:3455

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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