orjson does not limit recursion for deeply nested JSON documentsGHSA-pwr2-4v36-6qpr
HIGHFix: ijl/orjson@b0e4d2cGHSA-pwr2-4v36-6qpr is a high-severity (CVSS 7.5) CWE-674 vulnerability in orjson. A fix is available for orjson — see the affected versions and patch details below.
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 GHSA-pwr2-4v36-6qpr.
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
orjsonReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
orjson.loads in orjson before 3.9.15 does not limit recursion for deeply nested JSON documents.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | orjson | all versions | 3.9.15pip install --upgrade 'orjson==3.9.15' |
Affected Products
orjsonijlDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for orjson, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update orjson to 3.9.15 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pwr2-4v36-6qpr 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.
Frequently Asked Questions
Is GHSA-pwr2-4v36-6qpr in your dependencies?
Find it across PyPI, including transitive dependencies.