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MEDIUM severity

Regular Expression Denial of Service in jsoneditorGHSA-hhfg-6hfc-rvxm

MEDIUMFix: josdejong/jsoneditor@092e386

GHSA-hhfg-6hfc-rvxm is a medium-severity (CVSS 5.3) CWE-1333 vulnerability in jsoneditor. 1 public exploit reference exists, so weaponization risk is real. A fix is available for jsoneditor — see the affected versions and patch details below.

Also known asCVE-2021-3822
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk
0.00%0.64%1.28%1.92%0.3%1.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-hhfg-6hfc-rvxm by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

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.

440other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
jsoneditornpm
264Kdownloads / week

Description

JSON Editor is a web-based tool to view, edit, format, and validate JSON. It has various modes such as a tree editor, a code editor, and a plain text editor. The jsoneditor package is vulnerable to ReDoS (regular expression denial of service). An attacker that is able to provide a crafted element as input to the getInnerText function may cause an application to consume an excessive amount of CPU. Below pinned line using vulnerable regex.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmjsoneditorall versions9.5.6npm install jsoneditor@9.5.6

Affected Products

1 product · 1 configurations
Application
jsoneditorjsoneditoronline
< 9.5.6
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

jsoneditor is vulnerable to Inefficient Regular Expression Complexity

huntr.devNVDOct 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for jsoneditor, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update jsoneditor to 9.5.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hhfg-6hfc-rvxm is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

JSON Editor is a web-based tool to view, edit, format, and validate JSON. It has various modes such as a tree editor, a code editor, and a plain text editor. The jsoneditor package is vulnerable to ReDoS (regular expression denial of service). An attacker that is able to provide a crafted element as input to the getInnerText function may cause an application to consume an excessive amount of CPU. Below pinned line using vulnerable regex.
O3 Security · Impact-Aware SCA

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Regular Expression Denial of Service in jsoneditor