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HIGH severity

CVE-2023-2798 — htmlunit

HIGHFix: HtmlUnit/htmlunit@940dc7f

CVE-2023-2798 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in org.htmlunit:htmlunit. A fix is available for org.htmlunit:htmlunit — see the affected versions and patch details below.

Denial of service in HtmlUnit

Also known asGHSA-rc44-5cmh-879m
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs60th percentile — riskier than 60% of all scored CVEsHighest risk
0.00%0.47%0.94%1.41%0.1%0.9%Apr 26Aug 26Oct 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

1 pkg affected
☕org.htmlunit:htmlunit

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

Those using HtmlUnit to browse untrusted webpages may be vulnerable to Denial of service attacks (DoS). If HtmlUnit is running on user supplied web pages, an attacker may supply content that causes HtmlUnit to crash by a stack overflow. This effect may support a denial of service attack. This issue affects HtmlUnit before 2.70.0.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.htmlunit:htmlunitall versions2.70.0org.htmlunit:htmlunit:2.70.0

Affected Products

1 product · 1 configurations
Application
htmlunithtmlunit
< 2.70.0
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.htmlunit:htmlunit, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.htmlunit:htmlunit to 2.70.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-2798 is resolved across your whole dependency graph.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

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 HatModerate
ProductFixed inAdvisory
Migration Toolkit for Runtimes 1 on RHEL 8com.google.guava-guava-parentRHSA-2023:3814
MTA-6.2-RHEL-9mta/mta-operator-bundle:6.2.0-29RHSA-2023:4627

Frequently Asked Questions

Those using HtmlUnit to browse untrusted webpages may be vulnerable to Denial of service attacks (DoS). If HtmlUnit is running on user supplied web pages, an attacker may supply content that causes HtmlUnit to crash by a stack overflow. This effect may support a denial of service attack. This issue affects HtmlUnit before 2.70.0.
O3 Security · Impact-Aware SCA

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CVE-2023-2798: htmlunit DoS — Fixed in 2.70.0