Analyst readout for executives and security teams
Plain-English summary
This Chrome flaw could let a malicious web page run attacker-controlled code inside Chrome’s sandbox. A user must visit or open crafted HTML. The business risk is broad because Chrome is widely deployed, but the provided evidence does not show active exploitation.
Executive priority
Treat this as a high-priority browser update. It has severe impact potential, broad endpoint exposure, and a low-complexity remote attack path, but no supplied evidence of active exploitation.
Technical view
CVE-2026-9962 is a high-severity CWE-416 use-after-free in WebRTC in Google Chrome prior to 148.0.7778.216. The CVSS 3.1 score is 8.8 with network attack vector, low complexity, no privileges, and required user interaction.
Likely exposure
Organizations with Google Chrome versions prior to 148.0.7778.216 are potentially exposed. The provided sources do not identify other affected Chromium-based products or platforms.
Exploitation context
The vulnerability is remotely reachable through crafted HTML, but user interaction is required. The bundle marks KEV as false, and no provided source states active exploitation.
Researcher notes
Evidence is limited to the supplied bundle. The Chromium issue may have restricted details. The key confirmed facts are WebRTC use-after-free, crafted HTML trigger, sandboxed code execution, Chrome prior to 148.0.7778.216, and CVSS 8.8.
Mitigation direction
- Update Google Chrome to 148.0.7778.216 or later.
- Check Google Chrome Releases for the vendor’s official update guidance.
- Prioritize managed browser fleets and high-risk user groups.
- Confirm automatic browser updates are enabled and completing.
- Do not assume other browsers are affected without vendor confirmation.
Validation and detection
- Inventory Chrome versions across endpoints.
- Flag any Chrome version older than 148.0.7778.216.
- Confirm updated systems report the fixed version or later.
- Review browser management telemetry for failed updates.
- Track vendor advisories for any expanded affected-product list.
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-2026-9962 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:L/PR:N/UI:R/S:U/C:H/I:H/A:H 2.8 5.9 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
8.8 HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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/504716948 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.