CVE-2026-11645: Google Chromium V8 Out-of-Bounds Read and Write Vulnerability
Google Chromium V8 out-of-bounds read and write vulnerability that could allow a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
Overview
An out-of-bounds read and write flaw in the V8 JavaScript engine affects Google Chrome prior to version 149.0.7827.103, and extends to other Chromium-based browsers including Microsoft Edge and Opera. By inducing a victim to visit a crafted HTML page, a remote attacker can corrupt V8's memory and execute arbitrary code within the browser's renderer sandbox. No authentication is required; the only precondition is that the victim loads the malicious page.
Vulnerability details
The V8 JavaScript engine processes attacker-supplied web content and, under certain conditions, performs memory reads and writes outside the bounds of an allocated buffer. CWE-787 (out-of-bounds write) is the primary mechanism: a write past a buffer boundary corrupts adjacent memory in a way that can redirect execution. CWE-125 (out-of-bounds read) co-occurs, likely contributing to the memory access pattern that makes the corruption exploitable. Because V8 parses and executes JavaScript delivered by any web page, the attack surface is the browser's normal content-rendering path.
An attacker delivers a crafted HTML page containing malicious content that triggers the out-of-bounds memory access when V8 processes it. The victim must visit or be redirected to that page; no further interaction is required beyond the page load. Successful exploitation yields arbitrary code execution inside the Chromium renderer sandbox. The facts do not establish that a sandbox escape is achievable beyond that boundary, so the confirmed impact is in-sandbox code execution, not full host compromise.
Severity and impact
Exploitation status
This vulnerability is confirmed as actively exploited in the wild — it is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.
Detection and monitoring
- Review endpoint detection or browser crash telemetry for renderer process crashes (chrome.exe or msedge.exe child processes terminating abnormally) immediately before or during navigation to an external or unfamiliar origin, which can indicate a failed or partially successful memory-corruption attempt.
- Examine DNS and proxy logs for connections to newly registered or low-reputation domains initiated by a browser renderer process, particularly where the session has no prior browsing history to that host and the connection follows an unexpected redirect chain.
Remediation
Additional hardening
- Upgrade Google Chrome to 149.0.7827.103 or later; for other Chromium-based browsers such as Microsoft Edge and Opera, apply the corresponding vendor-released update that addresses this V8 memory-corruption flaw.
- Enforce Safe Browsing or equivalent URL-reputation filtering at the network perimeter and on managed endpoints to reduce the likelihood that users reach attacker-controlled pages delivering the crafted HTML payload.
- Where operationally feasible, deploy browser isolation or remote browser isolation (RBI) so that renderer-level code execution is confined to a disposable container rather than the endpoint itself.
- Restrict user browsing to approved or categorized sites on high-risk or privileged workstations, reducing the attack surface for drive-by delivery of malicious pages targeting this vulnerability.
Key dates
References
Frequently asked questions
Does CVE-2026-11645 affect my FedRAMP authorization?
If Google Chromium V8 runs inside your authorization boundary, CVE-2026-11645 is your problem. The vulnerability appears on CISA's Known Exploited Vulnerabilities (KEV) catalog, and the June 23, 2026 remediation deadline has already passed. For a FedRAMP-authorized service, an unpatched KEV is an assessor finding. An overdue one is visible to both your assessor and your sponsoring agency right now. You either close it out or formally document the mitigation and the delay.
How does Knox help me handle CVE-2026-11645?
Knox does not patch Google Chromium V8 on your behalf. Under the FedRAMP shared-responsibility model, that remediation belongs to you. What Knox provides is the pre-authorized, single-tenant boundary to remediate within, along with continuous compliance monitoring and audit-artifact coverage to document the fix for your next assessment. The work of applying the patch is yours. Managing your compliance posture while you do it is not something you have to handle alone.
How does Knox's monitoring help with vulnerabilities like this?
Knox's automated continuous monitoring platform watches your environment for newly disclosed vulnerabilities and compliance issues on an ongoing basis. That means exposure to something like CVE-2026-11645 surfaces during routine monitoring rather than only when an assessor flags it at review time, giving you a shorter window between disclosure and response.
How do I get FedRAMP authorized with Knox?
Knox runs a FedRAMP-as-a-Service platform. It gives SaaS vendors a pre-authorized cloud boundary on AWS, Azure, and GCP. Your application inherits 60-80% of the required security controls. You reach FedRAMP authorization in about 90 days for roughly 90% less than the traditional $3.5M path. Book a meeting and Knox will map your path to authorization.
CVE-2026-11645's remediation deadline of June 23, 2026 has passed. What happens now?
If CVE-2026-11645 remains unremediated, it is already a Plan of Action and Milestones (POA&M) item. A growing POA&M list is precisely what turns a routine continuous-monitoring review into a difficult conversation with your sponsoring agency. Closing the finding out and documenting why the deadline was missed is what keeps your authorization intact and the agency relationship in good standing.
Ready to achieve FedRAMP authorization in 90 days or less?
Schedule a meeting to discuss scope, parse readiness, and map your company’s accelerated path to FedRAMP authorization.
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