---
id: "CVE-2021-38003"
kind: "vulnerability"
aliases: ["CVE-2021-38003"]
title: "Google Chromium V8: Google Chromium V8 Memory Corruption Vulnerability"
severity: "high"
cvss: 8.8
epss: 0.38573
exploited: true
status: "open"
category: "runtime"
products: [{"name": "Google Chromium V8", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["browsers", "chrome", "chromium", "edge", "exploited", "opera", "runtime"]
not_affected_if: ["up-to-date-browser"]
published_at: "2021-11-03T00:00:00+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-38003", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-38003", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-38003", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Google Chromium V8: Google Chromium V8 Memory Corruption Vulnerability

A bug in Chromium's V8 JavaScript engine lets the internal TheHole value leak into script code through JSON.stringify, which corrupts memory. An attacker who gets a page to run script can use that memory corruption to attempt code execution in the browser.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Google Chromium V8 affected ? fixed ?

## How to check

Check the Chrome, Edge or Opera version in the browser's about page and compare it with the fixed release in the vendor advisory.

## Fix

Update Chrome, Edge, Opera or other Chromium-based browsers to a release that includes the V8 fix, as CISA requires per vendor instructions.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-38003
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-38003
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-38003

## From the sources

Google Chromium V8 Engine has a bug in JSON.stringify, where the internal TheHole value can leak to script code, causing memory corruption. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

CISA required action: Apply updates per vendor instructions.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_