Analyst readout for executives and security teams
Plain-English summary
This is a high-severity Chrome for Mac flaw that could let an attacker run code after persuading a user to install a malicious Chrome extension. The source bundle does not show active exploitation. Business risk is concentrated on unmanaged Macs and environments where users can freely install extensions.
Executive priority
Treat this as a prompt desktop-browser patching and extension-control issue, not as confirmed emergency exploitation. Prioritize macOS fleets, especially unmanaged devices and high-risk users who can install extensions.
Technical view
CVE-2026-9964 is a CWE-416 use-after-free in Chrome Bluetooth on macOS before 148.0.7778.216. The reported path is arbitrary code execution through a crafted Chrome extension after malicious extension installation. CVSS is 8.1 high. Public technical details are limited in the provided sources.
Likely exposure
Organizations with macOS endpoints running Google Chrome before 148.0.7778.216 are the likely exposure group. Risk increases where Chrome extension installation is not centrally controlled or audited.
Exploitation context
The bundle marks KEV as false and provides no cited evidence of active exploitation. Reported exploitation requires convincing a user to install a malicious Chrome extension, so user and extension governance are central controls.
Researcher notes
Public details are sparse. The cited description identifies a Chrome Bluetooth use-after-free on macOS with a crafted-extension execution path. The Chromium issue may have restricted details, so validation should focus on version exposure and extension governance rather than exploit reproduction.
Mitigation direction
- Update Chrome on macOS to 148.0.7778.216 or later through official channels.
- Restrict Chrome extension installation on managed Macs.
- Audit installed Chrome extensions and remove untrusted or unnecessary items.
- Prioritize unmanaged macOS endpoints and users with broad extension permissions.
- Check Google Chrome release guidance for any follow-up remediation details.
Validation and detection
- Inventory macOS endpoints with Google Chrome installed.
- Confirm Chrome versions are 148.0.7778.216 or later.
- Review enterprise policies controlling Chrome extension installation.
- Check installed extensions for unapproved or suspicious entries.
- Track Chrome release notes and CVE records for updated details.
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-416: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-9964 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
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/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:H/PR:N/UI:N/S:U/C:H/I:H/A:H 2.2 5.9 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
8.1 HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/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/505190999 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.