Analyst readout for executives and security teams
Plain-English summary
CVE-2026-9942 is a Chrome flaw in ANGLE that could let an attacker weaken site isolation after already compromising Chrome’s renderer. It requires a crafted HTML page and user interaction, so this is not a simple drive-by issue based on the provided evidence.
Executive priority
Treat this as a normal high-priority browser patch, not an emergency zero-day response from current evidence. The main business risk is exposure to chained browser attacks on outdated endpoints.
Technical view
The CVE describes CWE-457 uninitialized use in ANGLE in Google Chrome before 148.0.7778.216. A remote attacker with renderer compromise could bypass site isolation via crafted HTML. CVSS is 5.0 with high attack complexity, no privileges required, and low confidentiality, integrity, and availability impact.
Likely exposure
Organizations with managed or unmanaged desktop Chrome below 148.0.7778.216 are the relevant exposure. Risk is concentrated on endpoints where users browse untrusted web content. The CVE states user interaction is required and attack complexity is high.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. The attacker must first compromise the renderer process, then use crafted HTML to bypass site isolation. That makes this more serious as part of a browser exploit chain than as a standalone vulnerability.
Researcher notes
Evidence is limited to the CVE record, Google stable-channel reference, and Chromium issue reference. The issue may have restricted details. Do not infer exploit availability, affected Chromium-based products, or operational indicators beyond the provided sources.
Mitigation direction
- Update desktop Chrome to 148.0.7778.216 or later using Google’s stable-channel guidance.
- Prioritize managed browser fleets and high-risk user groups first.
- Keep browser auto-update enabled and monitor update compliance.
- Review Google’s advisory and Chromium issue for any revised guidance.
Validation and detection
- Inventory Chrome versions across managed and unmanaged endpoints.
- Confirm no Chrome installations remain below 148.0.7778.216.
- Check browser management reports for failed or deferred updates.
- Track whether CVE-2026-9942 appears in future KEV or vendor 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-457: 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 lookupCVE-2026-9942 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
- Medium
- CVSS
- 5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
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:U/C:L/I:L/A:L 1.6 3.4 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
5 MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
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/503438092 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 of Uninitialized Variable
Use of Uninitialized Variable represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.