GHSA-crqg-jrpj-fc84 is a medium-severity (CVSS 5.3) Deserialization of Untrusted Data vulnerability in org.apache.johnzon:johnzon-mapper. O3 Security confirms whether GHSA-crqg-jrpj-fc84 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Apache Johnzon Deserialization of Untrusted Data vulnerability
Real-World Exposure
org.apache.johnzon:johnzon-mapperReal-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
A malicious attacker can craft up some JSON input that uses large numbers (numbers such as 1e20000000) that Apache Johnzon will deserialize into BigDecimal and maybe use numbers too large which may result in a slow conversion (Denial of service risk). Apache Johnzon 1.2.21 mitigates this by setting a scale limit of 1000 (by default) to the BigDecimal.
This issue affects Apache Johnzon through 1.2.20.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.apache.johnzon:johnzon-mapper | all versions | 1.2.21 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.johnzon:johnzon-mapper. 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.apache.johnzon:johnzon-mapper to 1.2.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-crqg-jrpj-fc84 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-crqg-jrpj-fc84 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-crqg-jrpj-fc84. 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-crqg-jrpj-fc84 in your dependencies?
O3 detects GHSA-crqg-jrpj-fc84 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.