GHSA-9849-p7jc-9rmv is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in org.nokogiri:nekohtml. O3 Security confirms whether GHSA-9849-p7jc-9rmv is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
org.nokogiri:nekohtml vulnerable to Uncontrolled Resource Consumption
Real-World Exposure
org.nokogiri:nekohtmlReal-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
Summary
The fork of org.cyberneko.html used by Nokogiri (Rubygem) raises a java.lang.OutOfMemoryError exception when parsing ill-formed HTML markup.
Severity
The maintainers have evaluated this as High Severity 7.5 (CVSS3.1).
Mitigation
Upgrade to >= 1.9.22.noko2.
Credit
This vulnerability was reported by 이형관 (windshock).
References
CWE-400 Uncontrolled Resource Consumption
Notes
The upstream library org.cyberneko.html is no longer maintained. Nokogiri uses its own fork of this library located at https://github.com/sparklemotion/nekohtml and this CVE applies only to that fork. Other forks of nekohtml may have a similar vulnerability.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.nokogiri:nekohtml | all versions | 1.9.22.noko2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.nokogiri:nekohtml. 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.
Fix
Update org.nokogiri:nekohtml to 1.9.22.noko2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9849-p7jc-9rmv 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 pinpoints whether GHSA-9849-p7jc-9rmv 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-9849-p7jc-9rmv. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-9849-p7jc-9rmv in your dependencies?
O3 detects GHSA-9849-p7jc-9rmv across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.