GHSA-33vc-wfww-vjfv is a medium-severity (CVSS 4.7) Cross-site Scripting (XSS) vulnerability in jsondiffpatch. A fix is available for jsondiffpatch — see the affected versions and patch details below.
jsondiffpatch is vulnerable to Cross-site Scripting (XSS) via HtmlFormatter::nodeBegin
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for GHSA-33vc-wfww-vjfv.
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-33vc-wfww-vjfv 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 378,156 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.
jsondiffpatchnpmDescription
Vulnerability in jsondiffpatch
Versions of jsondiffpatch prior to 0.7.2 are vulnerable to Cross-site Scripting (XSS) in the HtmlFormatter (HtmlFormatter::nodeBegin). When diffs are rendered to HTML using the built-in formatter, untrusted payloads can inject scripts and execute in the context of a consuming web page.
Affected versions: >= 0, < 0.7.2 Patched version: 0.7.2
Remediation
Upgrade to jsondiffpatch 0.7.2 or later. The fix hardens the HTML formatter to avoid script injection.
Workarounds Avoid using the HTML formatter on untrusted diffs, or sanitize/escape the rendered output.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | jsondiffpatch | all versions | 0.7.2npm install jsondiffpatch@0.7.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for jsondiffpatch, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update jsondiffpatch to 0.7.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-33vc-wfww-vjfv 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-33vc-wfww-vjfv can be triaged on real exposure rather than presence alone.
Tailored to GHSA-33vc-wfww-vjfv. 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-33vc-wfww-vjfv in your dependencies?
O3 Security finds GHSA-33vc-wfww-vjfv across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.