CVE-2026-106292: Google Chrome Buffer Overflow Vulnerability

CVE-2026-106292 Overview

CVE-2026-106292 is a heap buffer overflow [CWE-122] in the Fonts component of Google Chrome prior to version 155.0.8059.39. An attacker who has already compromised the renderer process can leverage the flaw to execute arbitrary code outside the Chrome sandbox using a crafted HTML page. Google tracks the Chromium security severity as Medium, while the NVD CVSS score places the issue in the High range due to scope change and impact on confidentiality, integrity, and availability. The vulnerability affects Chrome on all supported desktop platforms and is addressed in the Stable channel update published by Google.

Critical Impact
Successful exploitation enables sandbox escape and arbitrary code execution on the host system from a compromised renderer process.

Affected Products

Google Chrome Desktop (Windows) prior to 155.0.8059.39
Google Chrome Desktop (macOS) prior to 155.0.8059.39
Google Chrome Desktop (Linux) prior to 155.0.8059.39

Discovery Timeline

2026-10-06 - CVE-2026-106292 published to the National Vulnerability Database
2026-10-07 - Last updated in NVD database

Technical Details for CVE-2026-106292

Vulnerability Analysis

The flaw resides in Chrome's Fonts handling code and manifests as a heap-based buffer overflow. The Fonts component processes font data referenced by rendered pages, and incorrect size validation allows writes beyond an allocated heap buffer. Because font processing occurs in a privileged path reachable from the renderer, the overflow can corrupt memory in a context that bridges the sandbox boundary. An attacker who already controls the renderer process, typically through a prior renderer bug, can shape heap state and trigger the overflow to achieve code execution outside the sandbox. Exploitation requires user interaction, specifically loading a crafted HTML page, and the attack complexity is high because the actor must first compromise the renderer and reliably control allocator state.

Root Cause

The root cause is improper bounds checking during font data processing, classified as CWE-122 Heap-based Buffer Overflow. Chromium issue 524587778 tracks the defect but remains access-restricted pending wider patch adoption.

Attack Vector

Exploitation is a two-stage chain. The attacker first compromises the Chrome renderer process through a separate vulnerability or a malicious web resource. The attacker then serves a crafted HTML page containing font payloads that trigger the Fonts component overflow. The resulting memory corruption enables code execution in a process with privileges beyond the sandboxed renderer.

No public proof-of-concept exploit code is available for CVE-2026-106292. See the Chromium Issue #524587778 tracker for technical details as they are released.

Detection Methods for CVE-2026-106292

Indicators of Compromise

Chrome renderer or browser process crashes referencing font parsing modules or heap corruption signatures in crash dumps.
Unexpected child processes spawned by chrome.exe following navigation to untrusted sites.
Outbound network connections from Chrome host processes to unknown command-and-control infrastructure after web browsing sessions.

Detection Strategies

Inventory Chrome installations across the fleet and flag any version earlier than 155.0.8059.39 as vulnerable.
Monitor endpoint telemetry for anomalous process lineage originating from Chrome, including shell, scripting, or LOLBin execution.
Alert on Chrome crash events that correlate with user navigation to recently visited external domains.

Monitoring Recommendations

Collect browser crash reports centrally and review stack traces for font-related modules.
Correlate web proxy logs with endpoint process creation events to identify suspicious page loads preceding Chrome anomalies.
Track Chrome auto-update status via management tooling to confirm deployment of the fixed build.

How to Mitigate CVE-2026-106292

Immediate Actions Required

Update Google Chrome to version 155.0.8059.39 or later on all Windows, macOS, and Linux endpoints.
Restart Chrome after the update to ensure the patched binaries are loaded into memory.
Verify enterprise Chrome deployments through policy management to confirm the fixed version is active.

Patch Information

Google released the fix in the Stable channel update announced in the Google Chrome Stable Update. The patched build is 155.0.8059.39. Chromium downstream distributions such as Microsoft Edge, Brave, Opera, and Vivaldi should be updated once vendors publish rebased releases.

Workarounds

Restrict browsing to trusted sites and enforce strict site isolation policies until patching is complete.
Disable or limit JavaScript on untrusted origins through enterprise policy to reduce renderer attack surface.
Deploy web filtering to block known malicious domains that could host exploit chains targeting Chrome.

bash

# Verify installed Chrome version on Linux endpoints
google-chrome --version

# Example enterprise policy enforcement on Windows (registry)
reg add "HKLM\Software\Policies\Google\Chrome" /v TargetVersionPrefix /t REG_SZ /d "155.0.8059.39" /f