CVE-2026-11668 Overview
CVE-2026-11668 is an uninitialized memory use vulnerability [CWE-457] in the codec subsystem of Google Chrome on Linux and ChromeOS. Versions prior to 149.0.7827.103 are affected. A remote attacker can leak cross-origin data by serving a crafted video file to a victim browser. The Chromium project rates the underlying security severity as High, while the NVD CVSS 3.1 base score is 4.3 (Medium). Exploitation requires user interaction, such as loading a page that references the malicious video resource. Successful exploitation breaks the same-origin policy and exposes confidential content from other origins.
Critical Impact
A crafted video file can trigger uninitialized memory reads in Chrome's codec pipeline, leaking cross-origin data and undermining same-origin isolation.
Affected Products
- Google Chrome on Linux prior to 149.0.7827.103
- Google ChromeOS prior to 149.0.7827.103
- Chromium-based builds shipped on Linux distributions
Discovery Timeline
- 2026-06-09 - CVE-2026-11668 published to NVD
- 2026-06-10 - Last updated in NVD database
Technical Details for CVE-2026-11668
Vulnerability Analysis
The flaw resides in Chrome's media codec handling on Linux and ChromeOS builds. When the browser decodes a specifically crafted video file, the codec path reads memory that was never properly initialized. The contents of that memory may include bytes from previously parsed cross-origin resources, decoded frames, or other process state. Because the read occurs inside the renderer's media pipeline, an attacker can observe the leaked data through side effects such as canvas pixel reads, WebGL textures, or timing-based oracles. The vulnerability is classified as Uninitialized Memory Use [CWE-457] and was assigned EPSS percentile 7.467, reflecting a low probability of imminent mass exploitation. No public proof-of-concept is currently listed in Exploit-DB, and the issue is not present on the CISA Known Exploited Vulnerabilities catalog.
Root Cause
The root cause is missing initialization of internal buffers or structure fields in the codec decode path before they are read. Chromium issue tracker entry 515419790 documents the defect. When a malformed or adversarial container drives the decoder along an unexpected branch, the uninitialized region is consumed as if it contained valid decoded output.
Attack Vector
The attack vector is network-based with required user interaction. The victim must navigate to an attacker-controlled page, or to a site that embeds a malicious video. No privileges and no authentication are required on the target. The attacker hosts a crafted media file referenced from a <video> element, fetch, or media source extension, and harvests leaked cross-origin bytes through observable rendering primitives.
No verified exploit code is publicly available. See the Chromium Issue Tracker Entry and the Google Chrome Desktop Update for additional context.
Detection Methods for CVE-2026-11668
Indicators of Compromise
- Browser process telemetry showing Chrome or Chromium versions earlier than 149.0.7827.103 on Linux or ChromeOS endpoints.
- Outbound requests to untrusted domains delivering video files with anomalous container or codec metadata.
- Pages embedding cross-origin <video> sources followed by canvas, WebGL, or fetch operations reading pixel or buffer data.
Detection Strategies
- Inventory installed Chrome and ChromeOS builds and flag any host below 149.0.7827.103.
- Inspect web proxy and DNS logs for video downloads from low-reputation domains, especially with mismatched MIME types or unusual codec parameters.
- Correlate browser child process crashes or sanitizer reports in managed Chrome deployments that may indicate codec parsing anomalies.
Monitoring Recommendations
- Track Chrome update compliance through enterprise policy reporting and endpoint management tooling.
- Alert on first-seen video content types delivered from external origins to high-value users.
- Capture browser version and patch state in EDR inventories so out-of-date Chromium installations surface in vulnerability dashboards.
How to Mitigate CVE-2026-11668
Immediate Actions Required
- Update Google Chrome on Linux to version 149.0.7827.103 or later across all managed endpoints.
- Roll ChromeOS devices to the stable channel build containing 149.0.7827.103 and verify reboots complete.
- Audit third-party Chromium-based browsers on Linux for backported fixes addressing the codec uninitialized read.
Patch Information
Google released the fix in the stable channel update documented in the Google Chrome Desktop Update. The corresponding Chromium defect is tracked as 515419790. Apply Chrome 149.0.7827.103 or later on Linux, and the equivalent ChromeOS stable build, to remediate the vulnerability.
Workarounds
- Restrict navigation to untrusted media sites using enterprise URL filtering until patching completes.
- Disable autoplay and aggressive media prefetching through Chrome enterprise policies to reduce exposure during the update window.
- Use site isolation and strict cross-origin policies on internal applications to limit the value of any leaked cross-origin bytes.
# Verify Chrome version on Linux endpoints
google-chrome --version
# Force update via package manager (Debian/Ubuntu)
sudo apt update && sudo apt install --only-upgrade google-chrome-stable
# Confirm patched build
google-chrome --version | grep -E '149\.0\.7827\.(103|[1-9][0-9]{2,})'
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
