Analyst readout for executives and security teams
Plain-English summary
CVE-2026-9899 is a high-severity Chrome vulnerability in ANGLE, Chrome's graphics translation layer. If an attacker already compromises the renderer process, a crafted HTML page could help escape the browser sandbox and gain stronger access on the user's system.
Executive priority
Treat this as a near-term browser patching priority. The exploit chain is not trivial, but sandbox escape potential makes delayed patching risky for users exposed to untrusted web content.
Technical view
The issue is a CWE-416 use-after-free in ANGLE in Google Chrome before 148.0.7778.216. The CVSS 3.1 score is 8.3 with network attack vector, required user interaction, high attack complexity, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations using Google Chrome versions prior to 148.0.7778.216 are potentially exposed. The source bundle does not identify other affected products or platforms, so do not extend scope beyond Chrome without vendor confirmation.
Exploitation context
The bundle does not cite active exploitation, and KEV status is false. Exploitation requires user interaction and prior renderer compromise, but successful exploitation could enable sandbox escape, raising impact materially.
Researcher notes
Key uncertainty is exploit maturity: the provided evidence does not show in-the-wild exploitation. The Chromium issue may contain restricted details. Focus validation on version exposure and patch completion, not exploit reproduction.
Mitigation direction
- Update Google Chrome following Google's stable channel guidance.
- Verify Chrome is not running a version prior to 148.0.7778.216.
- Prioritize managed desktop browser fleets and high-risk user groups.
- Monitor Google Chrome release notes for any revised mitigation guidance.
- Do not assume Chromium-based products are affected without vendor confirmation.
Validation and detection
- Inventory deployed Google Chrome versions across managed endpoints.
- Confirm patched systems report Chrome 148.0.7778.216 or later.
- Check endpoint management for failed or deferred browser updates.
- Review vulnerability scanner findings for CVE-2026-9899 after update rollout.
- Track CISA KEV and Google advisories for exploitation status changes.
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-2026-9899 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
- 8.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/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:H/PR:N/UI:R/S:C/C:H/I:H/A:H 1.6 6 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
8.3 HighVector: CVSS:3.1/AV:N/AC:H/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/497533569 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.