jsondiffpatch is vulnerable to Cross-site Scripting (XSS) via HtmlFormatter::nodeBegin

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2025-9910: 0.32% estimated exploitation activity in the next 30 days; percentile 24.72 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.

Published by the source

11 Sep 2025, 06:30 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 12:38 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-33vc-wfww-vjfv

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-33vc-wfww-vjfv

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# Patch Next advisory brief: CVE-2025-9910

Advisory: jsondiffpatch is vulnerable to Cross-site Scripting (XSS) via HtmlFormatter::nodeBegin
IDs: CVE-2025-9910, GHSA-33vc-wfww-vjfv
Record: https://patchnext.com/advisories/cve-2025-9910 (revision 3, source checked 26 Oct 2026, 12:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: jsondiffpatch 0.7.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm jsondiffpatch: affected < 0.7.2; fixed in 0.7.2

## Suggested inspection (read-only)
- `npm ls jsondiffpatch --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on jsondiffpatch.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-33vc-wfww-vjfv (OSV record GHSA-33vc-wfww-vjfv lists affected ranges: npm jsondiffpatch >=0 <0.7.2 (fixed))
- Verified: https://github.com/advisories/GHSA-33vc-wfww-vjfv (GitHub-reviewed advisory GHSA-33vc-wfww-vjfv lists affected ranges: npm jsondiffpatch >=0 <0.7.2)

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