GHSA-jc85-fpwf-qm7x
Fix: silentmatt/expr-eval#288GHSA-jc85-fpwf-qm7x is a Code Injection vulnerability in expr-eval. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-jc85-fpwf-qm7x is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
expr-eval does not restrict functions passed to the evaluate function
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.
expr-evalnpmexpr-eval-forknpmDescription
The expr-eval library is a JavaScript expression parser and evaluator designed to safely evaluate mathematical expressions with user-defined variables. However, due to insufficient input validation, an attacker can pass a crafted variables object into the evaluate() function and trigger arbitrary code execution.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | expr-eval | all versions | No fix |
| 📦npm | expr-eval-fork | all versions | 3.0.1 |
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 expr-eval. 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
No patched version of expr-eval has shipped for GHSA-jc85-fpwf-qm7x yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
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-jc85-fpwf-qm7x 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-jc85-fpwf-qm7x. 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-jc85-fpwf-qm7x in your dependencies?
O3 detects GHSA-jc85-fpwf-qm7x across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.