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Maven

GHSA-g9hh-vvx3-v37v

HIGH

GHSA-g9hh-vvx3-v37v is a high-severity (CVSS 7.5) vulnerability in net.sourceforge.htmlunit:neko-htmlunit. O3 Security confirms whether GHSA-g9hh-vvx3-v37v is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Denial of service in HtmlUnit-Neko

Also known asCVE-2022-28366
Published
Apr 23, 2022
Updated
Dec 5, 2024
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed

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-2022-24939.

Affected Packages

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

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. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  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 GHSA-g9hh-vvx3-v37v is resolved across your whole dependency graph.

  3. 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.

  4. How O3 protects you

    O3 pinpoints whether GHSA-g9hh-vvx3-v37v is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-g9hh-vvx3-v37v. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

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-2022-24939.
O3 Security · Impact-Aware SCA

Is GHSA-g9hh-vvx3-v37v in your dependencies?

O3 detects GHSA-g9hh-vvx3-v37v across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.