CVE-2026-79025 Overview
CVE-2026-79025 is an improper input validation vulnerability [CWE-20] in the Workers component of Google Chrome. Versions prior to 152.0.7977.65 are affected. The flaw allows a remote attacker who has already compromised the renderer process to bypass system access restrictions using a crafted HTML page. Google's Chromium project rated the underlying issue as Medium severity.
The vulnerability requires prior compromise of the renderer process, making it a sandbox escape or restriction bypass primitive rather than a direct initial-access flaw. It is typically chained with a separate renderer exploit to escape Chrome's security boundaries.
Critical Impact
Attackers chaining this flaw with a renderer compromise can bypass Chrome's system access restrictions and reach resources normally isolated by the browser sandbox.
Affected Products
- Google Chrome for Desktop prior to 152.0.7977.65
- Chromium-based browsers incorporating the vulnerable Workers implementation
- Any downstream distribution shipping Chromium builds earlier than 152.0.7977.65
Discovery Timeline
- 2026-08-25 - CVE-2026-79025 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-79025
Vulnerability Analysis
The vulnerability resides in Chrome's Workers implementation, which handles Web Workers, Service Workers, and related background execution contexts. Chrome enforces system access restrictions on Workers to prevent them from reaching resources outside the browser's isolation model.
Insufficient validation of input passed to Workers allows an attacker who controls a compromised renderer to submit values that bypass those checks. The result is unauthorized access to system-level operations that Chrome expects Workers to be prevented from performing.
Because exploitation requires a compromised renderer, the flaw functions as a second-stage primitive. It expands the impact of a prior renderer bug rather than serving as an entry point on its own. Refer to the Chromium Issue #537846307 tracker for additional technical detail.
Root Cause
The root cause is improper input validation [CWE-20] on parameters processed by the Workers subsystem. Boundary checks that enforce Chrome's access model were insufficient to reject crafted values supplied by a hostile renderer. This mismatch between the trust boundary and the validation logic allows the sandbox restriction bypass.
Attack Vector
An attacker first compromises the renderer process using a separate vulnerability. From within the compromised renderer, the attacker sends crafted requests through the Workers interface. The malformed input passes Chrome's checks and reaches system-access paths that should have been blocked. A crafted HTML page delivered to the victim initiates the chain. Public exploit code is not currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
No verified proof-of-concept code is public. See the Google Chrome Stable Update advisory for the vendor's exploitation notes.
Detection Methods for CVE-2026-79025
Indicators of Compromise
- Chrome renderer processes spawning unexpected child processes or performing system-level operations outside typical browsing behavior.
- Service Worker or Web Worker registrations from unfamiliar origins immediately followed by anomalous outbound network activity.
- Browser crash reports referencing the Workers subsystem on Chrome builds earlier than 152.0.7977.65.
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag any host running a build below 152.0.7977.65.
- Correlate browser process telemetry with subsequent file, registry, or network operations that fall outside expected renderer behavior.
- Alert on Chrome child processes accessing sensitive paths or making privileged system calls shortly after page navigation events.
Monitoring Recommendations
- Ingest Chrome update status from endpoint management tooling into the SIEM to identify unpatched hosts in near real time.
- Monitor for delivery of suspicious HTML payloads via email gateways and web proxies, especially those hosting Worker-heavy JavaScript.
- Track EPSS trend data for CVE-2026-79025, currently 0.22% at percentile 12.392, to detect shifts in exploitation likelihood.
How to Mitigate CVE-2026-79025
Immediate Actions Required
- Update Google Chrome to version 152.0.7977.65 or later on all managed endpoints.
- Restart browser sessions after the update to ensure the patched binaries are loaded.
- Verify Chromium-based third-party browsers have absorbed the upstream fix before considering the environment remediated.
Patch Information
Google released the fix in the Stable Channel update documented at Google Chrome Stable Update. Administrators should deploy Chrome 152.0.7977.65 or later through their standard update channel. Enterprise deployments using Chrome Browser Cloud Management or group policy should confirm the target version rolls out to all managed devices.
Workarounds
- Enforce automatic Chrome updates via group policy so patched builds deploy without user action.
- Restrict execution of untrusted HTML content through web filtering and browser isolation for high-risk users.
- Apply the principle of least privilege on endpoints so a browser sandbox escape yields limited follow-on impact.
# Verify Chrome version on Windows via PowerShell
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion
# Verify Chrome version on macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version
# Verify Chrome version on Linux
google-chrome --version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
