CVE-2026-13958 Overview
CVE-2026-13958 is an uninitialized memory use vulnerability in the Codecs component of Google Chrome on Windows. Versions prior to 150.0.7871.47 are affected. A remote attacker can obtain potentially sensitive information from process memory by serving a crafted HTML page to a targeted user. The flaw is classified under CWE-457: Use of Uninitialized Variable and requires user interaction, such as visiting an attacker-controlled webpage. Google assigned the issue a Chromium security severity of Medium and addressed it in the stable channel update for desktop.
Critical Impact
Remote attackers can read uninitialized process memory from Chrome, potentially exposing sensitive data such as tokens, keys, or fragments of previously processed content.
Affected Products
- Google Chrome on Windows prior to 150.0.7871.47
- Microsoft Windows platforms running vulnerable Chrome builds
- Chromium-based deployments incorporating the affected Codecs component
Discovery Timeline
- 2026-06-30 - CVE-2026-13958 published to NVD
- 2026-07-01 - Last updated in NVD database
Technical Details for CVE-2026-13958
Vulnerability Analysis
The vulnerability resides in the Codecs subsystem of Google Chrome. Chrome uses codec routines to decode media content embedded in HTML pages, including audio and video streams. When the codec path processes attacker-controlled input, it references a memory region that was never initialized to a known value. The uninitialized bytes reflect leftover data from prior allocations in the renderer process.
An attacker crafts an HTML page that triggers the vulnerable codec path and reads the resulting output through JavaScript or rendered content. This exposes fragments of process memory to the attacker. The exposed memory may include authentication material, session artifacts, or content from other web origins loaded in the same process.
The attack requires user interaction because the victim must load the malicious page. No privileges are required on the target system. Refer to the Chromium Issue Tracker Entry for upstream technical details.
Root Cause
The root cause is a missing initialization step in the Codecs component. A buffer or structure is allocated and used before its contents are set, which is the defining pattern of CWE-457. The stale bytes originate from the renderer heap and leak into attacker-observable output.
Attack Vector
Exploitation occurs over the network. The attacker hosts a crafted HTML page containing media or codec-related content that triggers the flawed initialization path. When a victim visits the page, Chrome processes the content and returns uninitialized memory to the page context. No authentication is required, and the impact is limited to confidentiality.
No verified proof-of-concept code has been published. The vulnerability mechanism is described in prose because no sanitized exploit code is available from authoritative sources.
Detection Methods for CVE-2026-13958
Indicators of Compromise
- Chrome browser processes running versions earlier than 150.0.7871.47 on Windows endpoints
- Outbound connections from user endpoints to unknown domains hosting media-heavy or codec-abusing HTML pages
- Renderer process crashes or anomalous memory usage patterns during media decoding
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag any build below 150.0.7871.47
- Correlate web proxy logs with threat intelligence feeds to identify user visits to suspicious pages that deliver crafted media content
- Monitor for repeated renderer crashes tied to codec modules, which may indicate exploitation attempts
Monitoring Recommendations
- Ingest Chrome update telemetry into the SIEM to confirm patch deployment status across endpoints
- Alert on user reports of unexpected browser behavior when visiting untrusted media sites
- Track browser process memory anomalies via endpoint telemetry to surface abuse of codec paths
How to Mitigate CVE-2026-13958
Immediate Actions Required
- Update Google Chrome on all Windows endpoints to version 150.0.7871.47 or later
- Restart Chrome processes after the update to ensure the patched binary is loaded
- Verify Chrome auto-update is enabled and functioning across managed devices
Patch Information
Google addressed the flaw in the stable channel update for desktop. Deploy Chrome 150.0.7871.47 or later. See the Google Chrome Stable Update advisory for release details. Enterprises managing Chrome via Group Policy should confirm the TargetVersionPrefix policy does not pin devices to a vulnerable build.
Workarounds
- Restrict browsing to trusted sites via web filtering until the patch is applied
- Disable or limit exposure to untrusted media content through browser policy where feasible
- Isolate high-risk users through browser isolation or virtualized browsing environments
# Verify installed Chrome version on Windows endpoints
reg query "HKLM\SOFTWARE\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv
# Force Chrome update via command line
"%ProgramFiles%\Google\Chrome\Application\chrome.exe" --check-for-update-interval=1
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
