GHSA-mpg4-rc92-vx8v is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in fast-xml-parser. 1 public exploit reference exists, so weaponization risk is real. A fix is available for fast-xml-parser — see the affected versions and patch details below.
fast-xml-parser vulnerable to ReDOS at currency parsing
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-mpg4-rc92-vx8v.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-mpg4-rc92-vx8v plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,567 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
fast-xml-parsernpmDescription
Summary
A ReDOS that exists on currency.js was discovered by Gauss Security Labs R&D team.
Details
https://github.com/NaturalIntelligence/fast-xml-parser/blob/v4.4.0/src/v5/valueParsers/currency.js#L10 contains a vulnerable regex
PoC
pass the following string '\t'.repeat(13337) + '.'
Impact
Denial of service during currency parsing in experimental version 5 of fast-xml-parser-library
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | fast-xml-parser | ≥ 4.3.5&&< 4.4.1 | 4.4.1npm install fast-xml-parser@4.4.1 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for fast-xml-parser, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update fast-xml-parser to 4.4.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mpg4-rc92-vx8v 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-mpg4-rc92-vx8v can be triaged on real exposure rather than presence alone.
Tailored to GHSA-mpg4-rc92-vx8v. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Red Hat has decided to rate this vulnerability as Important due to the potential loss of Availability and the low complexity.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Developer Hub 1.2 on RHEL 9 | rhdh/rhdh-hub-rhel9:1.2-136 | RHBA-2024:5958 |
| RHEL-9-CNV-4.16 | container-native-virtualization/kubevirt-console-plugin-rhel9:v4.16.1-107 | RHSA-2024:5054 |
| RHODF-4.14-RHEL-9 | odf4/mcg-core-rhel9:v4.14.11-1 | RHSA-2024:7624 |
| RHODF-4.16-RHEL-9 | odf4/mcg-core-rhel9:v4.16.2-2 | RHSA-2024:6755 |
| RHODF-4.17-RHEL-9 | odf4/mcg-core-rhel9:v4.17.0-69 | RHSA-2024:8676 |
Frequently Asked Questions
Is GHSA-mpg4-rc92-vx8v in your dependencies?
O3 Security finds GHSA-mpg4-rc92-vx8v across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.