---
id: "CVE-2026-121125"
kind: "vulnerability"
aliases: ["CVE-2026-121125"]
title: "Chrome: ServiceWorker flaw leaks data to an attacker who already controls the renderer"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["browsers", "chrome", "endpoints", "other"]
not_affected_if: ["chrome-at-or-above-157.0.8103.38"]
published_at: "2026-11-03T21:17:20+00:00"
first_seen_at: "2026-11-03T21:19:19+00:00"
updated_at: "2026-11-03T21:24:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121125", "first_seen_at": "2026-11-03T21:19:19+00:00"}]
---

# Chrome: ServiceWorker flaw leaks data to an attacker who already controls the renderer

Google Chrome versions before 157.0.8103.38 have an information leak in ServiceWorker. A remote attacker who had already compromised the renderer process can read sensitive information through a crafted HTML page.

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

## How to check

- Check the installed Chrome version in Chrome's About page or with `google-chrome --version` on Linux
- Compare the result against `157.0.8103.38`

## Fix

- Google Chrome: update to `157.0.8103.38` or later

## Timeline

- 2026-11-03T21:19:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121125

## From the sources

Information leak in ServiceWorker in Google Chrome prior to 157.0.8103.38 allowed a remote attacker who had compromised the renderer process to obtain sensitive information via a crafted HTML page. (Chromium security severity: Low)

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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_