Back Securityweek

Chrome, Firefox Updates Patch Over 100 Vulnerabilities

Securityweek •Ionut Arghire • September 30, 2026

Google and Mozilla on Tuesday announced fresh Chrome and Firefox updates that address over 100 vulnerabilities.

The latest Chrome release was rolled out with fixes for 32 security defects, including a critical-severity buffer overflow issue in ANGLE tracked as CVE-2026-102331 and reported by an external researcher.

Google addressed 25 high-severity security weaknesses, most of which are uninitialized resource and use-after-free vulnerabilities. It also resolved five high-severity type confusion flaws in the V8 JavaScript and WebAssembly engine.

The browser update also fixes high-severity improper privilege management, UI misconfiguration, out-of-bounds read/write, cross-site scripting (XSS), and buffer overflow issues.

External researchers reported 15 of the patched security holes, but Google has not disclosed the bounty rewards paid for 14 of them. According to its advisory, the company handed out $1,000 for a low-severity missing authorization bug in Payments.

The latest Chrome iteration is now rolling out to users as versions 154.0.8037.92/.93 for Windows and macOS, and as version 154.0.8037.92 for Linux.

Mozilla released Firefox 157 with patches for approximately 76 vulnerabilities, including 38 high-severity security defects, mostly use-after-free and sandbox escape bugs.

The fresh Firefox update also resolves high-severity incorrect boundary conditions, uninitialized memory, privilege escalation, information disclosure, invalid pointer, and JIT miscompilation issues.

Many of the vulnerabilities resolved in Firefox 157 were also fixed in Firefox ESR 153.4, 140.17, and 115.42.

Google and Mozilla make no mention of any of these security defects being exploited in the wild, but users are advised to update their browsers as soon as possible.

Related: High-Severity Vulnerabilities Patched in OpenSSL, WolfSSL

Related: New Spectre v2 Variant Exposes Intel, AMD, Arm CPUs to Data Leaks

Related: Apple Patches Zero-Day Linked to ‘Extremely Sophisticated Attack’

Related: Kiteworks Urges Server Shutdown, Finds Advanced Forms Vulnerability

Ionut Arghire is an international correspondent for SecurityWeek.

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Chrome Update Addresses 33 Security Flaws Including CVE-2026-102331 On September 29, 2026, Google released a Chrome update addressing 33 security vulnerabilities, including a critical buffer overflow flaw in ANGLE, tracked as CVE-2026-102331. This update affects Chrome versions 154.0.8037.92/.93 for Windows and macOS, and 154.0.8037.92 for Linux. The critical flaw, reported by an external researcher, poses a significant risk due to its potential for exploitation. Additionally, the update includes fixes for several high-severity vulnerabilities, particularly in the V8 JavaScript engine, which include type confusion and use-after-free issues. Users are urged to update their browsers promptly to mitigate risks. Mozilla also released a Firefox update addressing 76 vulnerabilities, but no exploitation in the wild has been reported for either browser. The updates are part of ongoing efforts to enhance browser security and protect users from potential threats. 3 sources 72

Extracted Entities

Chrome, Firefox Updates Patch Over 100 Vulnerabilities

The full story

Extracted Entities

APT Groups (1)

Campaigns (1)

CVEs (1)

CWE Weaknesses (7)

Platforms (3)

Vulnerabilities (1)