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HIGH severity

CVE-2022-28366 — neko-htmlunit

HIGH

CVE-2022-28366 is a high-severity (CVSS 7.5) vulnerability in net.sourceforge.htmlunit:neko-htmlunit. A fix is available for net.sourceforge.htmlunit:neko-htmlunit — see the affected versions and patch details below.

Denial of service in HtmlUnit-Neko

Also known asGHSA-g9hh-vvx3-v37v
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk
0.00%0.93%1.86%2.79%0.2%2.2%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

1 pkg affected
☕net.sourceforge.htmlunit:neko-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

Certain Neko-related HTML parsers allow a denial of service via crafted Processing Instruction (PI) input that causes excessive heap memory consumption. In particular, this issue exists in HtmlUnit-Neko through 2.26, and is fixed in 2.27. This issue also exists in CyberNeko HTML through 1.9.22 (also affecting OWASP AntiSamy before 1.6.6), but 1.9.22 is the last version of CyberNeko HTML. NOTE: this may be related to CVE-2022-24839.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavennet.sourceforge.htmlunit:neko-htmlunitall versions2.27net.sourceforge.htmlunit:neko-htmlunit:2.27

Affected Products

3 products · 3 configurations
Application
antisamyantisamy_project
< 1.6.6
range
Application
cyberneko htmlcyberneko_html_project
≤ 1.9.22
range
Application
htmlunithtmlunit
< 2.27
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 net.sourceforge.htmlunit:neko-htmlunit, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update net.sourceforge.htmlunit:neko-htmlunit to 2.27 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-28366 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.

Frequently Asked Questions

Certain Neko-related HTML parsers allow a denial of service via crafted Processing Instruction (PI) input that causes excessive heap memory consumption. In particular, this issue exists in HtmlUnit-Neko through 2.26, and is fixed in 2.27. This issue also exists in CyberNeko HTML through 1.9.22 (also affecting OWASP AntiSamy before 1.6.6), but 1.9.22 is the last version of CyberNeko HTML. NOTE: this may be related to CVE-2022-24839.
O3 Security · Impact-Aware SCA

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CVE-2022-28366: neko-htmlunit DoS — Fixed in 2.27