Analyst readout for executives and security teams
Plain-English summary
This is a high-severity Chrome memory-safety flaw in ANGLE. A malicious web page could potentially corrupt heap memory after a user visits it. The provided sources do not show active exploitation or KEV listing, but browser flaws with this profile deserve fast enterprise patching.
Executive priority
Treat as a near-term patching priority for all managed desktops. It is not supported as an emergency zero-day from the provided evidence, but the browser attack surface and high CVSS score justify accelerated rollout and verification.
Technical view
CVE-2026-9940 is a CWE-122 heap buffer overflow in ANGLE affecting Google Chrome prior to 148.0.7778.216, with CVSS 8.8. The attack vector is network-based, requires user interaction, and may allow confidentiality, integrity, and availability impact through heap corruption from crafted HTML.
Likely exposure
Organizations with desktop Chrome installations older than 148.0.7778.216 are the likely exposure. Risk is highest for users who browse untrusted sites or receive links from external sources. The source bundle does not identify other affected products.
Exploitation context
The CVE describes potential exploitation via a crafted HTML page. User interaction is required. The source bundle marks KEV as false and provides no cited evidence of active exploitation, public exploit availability, or weaponized campaigns.
Researcher notes
Public detail is limited. The Chromium issue may be restricted, and the bundle does not include root-cause specifics beyond ANGLE heap buffer overflow and crafted HTML. Avoid assuming exploitability details, affected platforms beyond Chrome desktop context, or mitigations beyond vendor update guidance.
Mitigation direction
- Update Chrome through the Stable Channel to the vendor-fixed build or later.
- Prioritize managed desktop fleets and users exposed to untrusted web content.
- Confirm enterprise update controls are not delaying Chrome security updates.
- Monitor Google’s advisory and Chromium issue for revised guidance.
Validation and detection
- Inventory Chrome versions and flag builds before 148.0.7778.216.
- Confirm endpoints successfully receive Chrome Stable Channel updates.
- Review browser crash and endpoint telemetry for unusual renderer or GPU-process crashes.
- Verify vulnerability scanners map this CVE to Chrome version evidence.
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-122: 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-2026-9940 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/502738003 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.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.