CVE-2022-24839 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in org.nokogiri:nekohtml. A fix is available for org.nokogiri:nekohtml — see the affected versions and patch details below.
Uncontrolled Resource Consumption in org.cyberneko.html (nokogiri fork)
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2022-24839.
EPSS Exploitation Probability
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
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The upstream library org.cyberneko.html is no longer maintained.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.noko2org.nokogiri:nekohtml:1.9.22.noko2 |
Affected Products
nekohtmlnekohtml_projectweblogic serveroracleDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.nokogiri:nekohtml, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
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 CVE-2022-24839 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.
Frequently Asked Questions
Is CVE-2022-24839 in your dependencies?
Find it across Maven, including transitive dependencies.