Analyst readout for executives and security teams
Plain-English summary
This Chrome flaw can let a malicious web page break out of Chrome's sandbox through the GPU component. That raises business risk because a normal browsing action could expose data or systems if users run an unpatched Chrome build.
Executive priority
Treat this as urgent browser patching. The issue has critical CVSS impact and sandbox-escape potential, but the provided evidence does not show active exploitation.
Technical view
CVE-2026-9967 is a CWE-787 out-of-bounds write in Chrome's GPU component before 148.0.7778.216. The CVSS 3.1 vector is network-based, low complexity, no privileges required, user interaction required, changed scope, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely for desktop endpoints running Google Chrome versions earlier than 148.0.7778.216. The bundle does not identify other Chromium-based browsers or platforms, so do not assume coverage without vendor confirmation.
Exploitation context
The source states a remote attacker could potentially perform sandbox escape via a crafted HTML page. KEV is false, and the provided sources do not state active exploitation or public exploit availability.
Researcher notes
Public technical detail is limited. The Chromium issue reference may not expose full internals. Validation should focus on version state, patch deployment, and monitoring rather than exploit reproduction.
Mitigation direction
- Update Google Chrome to 148.0.7778.216 or later through managed update channels.
- Prioritize Chrome updates on user workstations and high-risk browsing environments.
- Check Google's release guidance for any platform-specific update instructions.
- Monitor CISA KEV and Google Chrome release notes for exploitation status changes.
Validation and detection
- Inventory Chrome versions across managed endpoints.
- Confirm no desktop Chrome install remains below 148.0.7778.216.
- Verify browser update policies are active and reporting successful installs.
- Review security telemetry for suspicious browser crashes or sandbox-related alerts.
Public sources used
Based on public source material and reviewed before publication.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-9967 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H 2.8 6 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
9.6 CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reserved CVE Program
The CVE ID was reserved by the assigning CNA.
- CVE published CVE Program
The CVE record was published.
- CVE updated CVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 source CVE List V5
- https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html CVE reference, Chrome
- https://issues.chromium.org/issues/506414791 CVE reference, Chrome
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.