# Chromium Extended Stable update 156.0.8078.88 addresses 55 security vulnerabilities

> **Key takeaway:** Google has released a major security update for the Chromium Extended Stable channel, patching 55 vulnerabilities including three critical CVEs.

**Published:** 2026-11-03T21:06:41.026000+00:00 
**Source:** Google Chromium Engineering Releases 
**Category:** bigtech-foss 
**Canonical URL:** https://fosswire.org/news/chromium-extended-stable-update-1560807888-addresses-55-secu.html 

## Summary
Google has deployed version 156.0.8078.88 to the Chromium Extended Stable channel for Windows and Mac desktop users. This update is a significant security maintenance release designed to mitigate a large volume of identified vulnerabilities.

The release addresses a total of 55 security fixes, ranging from low to critical severity. Google noted that specific bug details and links may remain restricted until a majority of the user base has successfully updated to prevent exploitation of the disclosed flaws.

## Security vulnerability breakdown
- **Critical Vulnerabilities:** The update patches three critical-severity flaws, specifically CVE-2026-118306, CVE-2026-121156, and CVE-2026-76024.
- **High Severity Fixes:** A large portion of the release focuses on high-severity vulnerabilities, including a significant cluster of CVEs in the 2026-1192xx, 2026-1210xx, 2026-1211xx, and 2026-760xx ranges.
- **Severity Distribution:** Beyond the critical and high-priority patches, the update also resolves several medium-severity issues (CVE-2026-119272, CVE-2026-121135) and one low-severity issue (CVE-2026-121141).
- **Information Restriction Policy:** Google maintains a policy of withholding full technical details for certain bugs if they reside in third-party libraries that have not yet been patched by other dependent projects.

## Why it matters
As the upstream foundation for many open-source browsers and web engines, these security patches are vital for the broader ecosystem. Developers of Chromium-based browsers and tools must track these updates to ensure their downstream distributions remain protected against these critical and high-severity exploits.