CVE-2026-54756: Jodit Jodit Has Prototype Pollution Vulnerability

MODERATE
Advisory Identifier: GHSA-5957-5c94-3v7w
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CWE-1321
Published
Advisory Summary

CVE-2026-54756 is a MODERATE jodit has prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Jodit libraries in the npm ecosystem. The issue involves jodit has prototype pollution via jodit.configure() / configmerge. Remediation is available by upgrading affected packages to version 4.12.18.

CVE-2026-54756 at a Glance

CVE Identifier CVE-2026-54756
GHSA Identifier GHSA-5957-5c94-3v7w
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Jodit
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-54756

To remediate this vulnerability, upgrade all affected Jodit dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

jodit fixed: 4.12.18 
npm install jodit@4.12.18
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls jodit

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-54756, inspect your project dependencies using npm:

npm ls jodit

Analyze the terminal output to locate any version of Jodit in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.12.18), your application is affected.

Note: The npm ls jodit command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where the product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. In Jodit, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary `Jodit.configure(options)` — and the internal `ConfigMerge` / `ConfigProto` helpers — merged user-supplied options into the editor configuration without filtering prototype-mutating keys. A payload nested under an existing plain-object option such as `controls` could reach and mutate `Object.prototype` (prototype pollution). ### Affected - Package: `jodit` (npm) - Versions: `< 4.12.18` - Public API: `Jodit.configure(options)` ### Proof of Concept ```js import { Jodit } from 'jodit'; delete Object.prototype.polluted; Jodit.configure(JSON.parse('{"controls":{"__proto__":{"polluted":"yes"}}}')); console.log(({}).polluted); // "yes" (before the fix) delete Object.prototype.polluted; ``` ### Impact Applications that pass user-controlled or partially user-controlled configuration into `Jodit.configure()` could be vulnerable to prototype pollution: unexpected property injection, logic bypass, denial of service, or secondary security issues. ### Patch Fixed in 4.12.18 by rejecting `__proto__`, `constructor`, and `prototype` at every merge level in `ConfigMerge` and `ConfigProto`. ### Credit Responsibly reported by Junming Wu.

CVE-2026-54756 Affected Jodit Versions

1 component(s)
Fixed Versions:
4.12.18
Product / Package Ecosystem Affected Versions Fixed Version
jodit
npm/jodit
npm
< 4.12.18
4.12.18

References

Jodit Source Repository REPOSITORY
https://github.com/xdan/jodit
GitHub Advisory / Wiki ADVISORY
https://github.com/xdan/jodit/security/advisories/GHSA-5957-5c94-3v7w
NVD — CVE-2026-54756 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54756
Security Fix Commit FIX COMMIT
https://github.com/xdan/jodit/commit/d298397bc993793b17145806c15f7dae53f90104
Jodit Release RELEASE
https://github.com/xdan/jodit/releases/tag/4.12.18

Frequently Asked Questions

What is CVE-2026-54756?
CVE-2026-54756 is a security vulnerability in Jodit involving Jodit has prototype pollution via Jodit.configure() / ConfigMerge under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Jodit versions are affected?
Affected versions include releases prior to 4.12.18 across affected packages: jodit.
What version fixes CVE-2026-54756?
Upgrading to 4.12.18 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jodit affected?
Yes, jodit is affected in releases prior to 4.12.18. Upgrade your dependency to 4.12.18 or later.
What CWE is associated with CVE-2026-54756?
CVE-2026-54756 is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.).
How can I check npm dependencies for CVE-2026-54756?
Run the dependency tree command: 'npm ls jodit'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5957-5c94-3v7w",
  "modified" : "2026-07-31T19:10:17Z",
  "published" : "2026-07-31T19:10:16Z",
  "aliases" : [ "CVE-2026-54756" ],
  "summary" : "Jodit has prototype pollution via Jodit.configure() / ConfigMerge",
  "details" : "### Summary\n`Jodit.configure(options)` — and the internal `ConfigMerge` / `ConfigProto` helpers — merged user-supplied options into the editor configuration without filtering prototype-mutating keys. A payload nested under an existing plain-object option such as `controls` could reach and mutate `Object.prototype` (prototype pollution).\n\n### Affected\n- Package: `jodit` (npm)\n- Versions: `< 4.12.18`\n- Public API: `Jodit.configure(options)`\n\n### Proof of Concept\n```js\nimport { Jodit } from 'jodit';\ndelete Object.prototype.polluted;\nJodit.configure(JSON.parse('{\"controls\":{\"__proto__\":{\"polluted\":\"yes\"}}}'));\nconsole.log(({}).polluted); // \"yes\" (before the fix)\ndelete Object.prototype.polluted;\n```\n\n### Impact\nApplications that pass user-controlled or partially user-controlled configuration into `Jodit.configure()` could be vulnerable to prototype pollution: unexpected property injection, logic bypass, denial of service, or secondary security issues.\n\n### Patch\nFixed in 4.12.18 by rejecting `__proto__`, `constructor`, and `prototype` at every merge level in `ConfigMerge` and `ConfigProto`.\n\n### Credit\nResponsibly reported by Junming Wu.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "jodit"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.12.18"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/xdan/jodit/security/advisories/GHSA-5957-5c94-3v7w"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-54756"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xdan/jodit/commit/d298397bc993793b17145806c15f7dae53f90104"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/xdan/jodit"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xdan/jodit/releases/tag/4.12.18"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-31T19:10:16Z",
    "nvd_published_at" : "2026-07-01T21:17:03Z"
  }
}