Analyst readout for executives and security teams
Plain-English summary
This is a critical Chrome for Mac vulnerability tied to Bluetooth memory handling. The described attack depends on a user installing a malicious Chrome extension, after which the attacker could potentially escape Chrome’s sandbox. No active exploitation is stated in the supplied sources.
Executive priority
Prioritize rapid Chrome update compliance on macOS, especially for workstations with sensitive access. The main business risk is browser sandbox escape after malicious extension installation.
Technical view
CVE-2026-9881 is a CWE-416 use-after-free in Chrome Bluetooth on macOS before 148.0.7778.216. The source describes potential sandbox escape through a crafted Chrome Extension. CVSS is 9.0 with changed scope and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations using Google Chrome on macOS versions prior to 148.0.7778.216 are the relevant exposure population. Risk is higher where users can install unapproved extensions or extension controls are weak.
Exploitation context
The provided description requires convincing a user to install a malicious extension. The bundle marks KEV as false and does not cite public exploitation. Treat exploitation evidence as incomplete, not proven active.
Researcher notes
Focus validation on Chrome macOS version state, extension policy posture, and evidence of suspicious extension installation. The public issue may have limited detail, and the bundle does not provide exploit artifacts or indicators.
Mitigation direction
- Update Chrome on macOS to 148.0.7778.216 or later.
- Restrict Chrome extension installation to approved enterprise allowlists.
- Remove unknown or unnecessary extensions from managed Mac fleets.
- Review Chrome release guidance for any additional vendor instructions.
Validation and detection
- Inventory Chrome versions on all macOS endpoints.
- Confirm managed Macs are at 148.0.7778.216 or later.
- Audit installed Chrome extensions for unapproved or suspicious entries.
- Verify enterprise extension policies prevent user-installed untrusted extensions.
- Monitor the Chromium issue and Chrome release notes for updates.
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 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-2026-9881 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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:H/PR:N/UI:N/S:C/C:H/I:H/A:H 2.2 6 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
9 CriticalVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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/505140741 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.