GHSA-v6gp-9mmm-c6p5 — nokogiri
HIGHGHSA-v6gp-9mmm-c6p5 is a high-severity (CVSS 7.5) remote code execution vulnerability in nokogiri. A fix is available for nokogiri — see the affected versions and patch details below.
Out-of-bounds Write in zlib affects Nokogiri
Real-World Exposure
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Description
Summary
Nokogiri v1.13.4 updates the vendored zlib from 1.2.11 to 1.2.12, which addresses CVE-2018-25032. That CVE is scored as CVSS 7.4 "High" on the NVD record as of 2022-04-05.
Please note that this advisory only applies to the CRuby implementation of Nokogiri < 1.13.4, and only if the packaged version of zlib is being used. Please see this document for a complete description of which platform gems vendor zlib. If you've overridden defaults at installation time to use system libraries instead of packaged libraries, you should instead pay attention to your distro's zlib release announcements.
Mitigation
Upgrade to Nokogiri >= v1.13.4.
Impact
CVE-2018-25032 in zlib
- Severity: High
- Type: CWE-787 Out of bounds write
- Description: zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | nokogiri | all versions | 1.13.4bundle update nokogiri --conservative |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for nokogiri, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update nokogiri to 1.13.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-v6gp-9mmm-c6p5 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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-v6gp-9mmm-c6p5 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-v6gp-9mmm-c6p5. 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-v6gp-9mmm-c6p5 in your dependencies?
O3 Security finds GHSA-v6gp-9mmm-c6p5 across RubyGems dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.