CVE-2026-9939: Heap buffer overflow in Google Chrome
CVE-2026-9939 is a heap buffer overflow vulnerability in the WebCodecs component of Google Chrome versions prior to 148.0.7778.216. This flaw allows a remote attacker to execute arbitrary code within the browser's sandbox by tricking a user into visiting a specially crafted HTML page. The vulnerability has a high severity rating with a CVSS score of 8.8, indicating significant potential impact on confidentiality, integrity, and availability. There are no known exploits in the wild at this time. A vendor advisory from Google confirms the issue and references a stable channel update addressing this vulnerability.
AI Analysis
Technical Summary
This vulnerability is a heap buffer overflow in the WebCodecs feature of Google Chrome before version 148.0.7778.216. Exploitation requires user interaction (UI:R) and can be triggered remotely via a crafted HTML page, leading to arbitrary code execution inside the sandbox. The CVSS vector indicates the attack complexity is low, no privileges are required, and the impact is high across confidentiality, integrity, and availability. The issue is publicly disclosed and fixed in the referenced Chrome stable update.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary code within the sandboxed environment of the browser, potentially compromising user data and system integrity. The high CVSS score reflects the critical nature of the impact on confidentiality, integrity, and availability. However, exploitation requires user interaction and no known active exploits have been reported.
Mitigation Recommendations
Google has released an update to Chrome version 148.0.7778.216 that addresses this vulnerability. Users and administrators should apply this official fix by updating to the latest stable Chrome release as detailed in the vendor advisory at https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html. No additional mitigations are specified by the vendor.
CVE-2026-9939: Heap buffer overflow in Google Chrome
Description
CVE-2026-9939 is a heap buffer overflow vulnerability in the WebCodecs component of Google Chrome versions prior to 148.0.7778.216. This flaw allows a remote attacker to execute arbitrary code within the browser's sandbox by tricking a user into visiting a specially crafted HTML page. The vulnerability has a high severity rating with a CVSS score of 8.8, indicating significant potential impact on confidentiality, integrity, and availability. There are no known exploits in the wild at this time. A vendor advisory from Google confirms the issue and references a stable channel update addressing this vulnerability.
CVSS v3.1
Score 8.8high
Affected software
pkg:github/chromium/chromiumRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a heap buffer overflow in the WebCodecs feature of Google Chrome before version 148.0.7778.216. Exploitation requires user interaction (UI:R) and can be triggered remotely via a crafted HTML page, leading to arbitrary code execution inside the sandbox. The CVSS vector indicates the attack complexity is low, no privileges are required, and the impact is high across confidentiality, integrity, and availability. The issue is publicly disclosed and fixed in the referenced Chrome stable update.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary code within the sandboxed environment of the browser, potentially compromising user data and system integrity. The high CVSS score reflects the critical nature of the impact on confidentiality, integrity, and availability. However, exploitation requires user interaction and no known active exploits have been reported.
Mitigation Recommendations
Google has released an update to Chrome version 148.0.7778.216 that addresses this vulnerability. Users and administrators should apply this official fix by updating to the latest stable Chrome release as detailed in the vendor advisory at https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html. No additional mitigations are specified by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Chrome
- Date Reserved
- 2026-05-28T17:24:55.812Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html","vendor":"Google"}]
Threat ID: 6a18c66fe29bf47b503b60d1
Added to database: 05/28/2026, 22:49:19 UTC
Last enriched: 06/05/2026, 21:14:04 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 47
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