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MEDIUM severity

jsondiffpatch is vulnerable to Cross-site Scripting (XSS) via HtmlFormatter::nodeBeginGHSA-33vc-wfww-vjfv

MEDIUMFix: benjamine/jsondiffpatch@0e374b5

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.

Also known asCVE-2025-9910
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

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

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs22th percentile — riskier than 22% of all scored CVEsHighest risk
0.00%0.27%0.53%0.80%0.0%0.3%Apr 26Aug 26Oct 26

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

1 pkg affected

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.

608other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
jsondiffpatchnpm
1.6Mdownloads / week

Description

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

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmjsondiffpatchall versions0.7.2npm install jsondiffpatch@0.7.2

Detection & mitigation playbook

Open-source dependency

  1. Detect

    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.

  2. 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.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### 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/
O3 Security · Impact-Aware SCA

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jsondiffpatch is vulnerable to Cross-site Scripting (XSS)…