Analyst readout for executives and security teams
Plain-English summary
CVE-2026-9930 is a Chrome for Mac memory-safety flaw in the Dawn component. A user would need to open a crafted HTML page. The public record rates the CVSS impact as limited, but Chromium labels the security severity High, so Mac Chrome updates should be prioritized.
Executive priority
Treat this as a near-term browser patching item, not a crisis. Prioritize Mac Chrome update compliance because browser flaws can be reached through web content, but current public evidence does not show active exploitation.
Technical view
The issue is an out-of-bounds write in Dawn affecting Google Chrome on Mac before 148.0.7778.216. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N, indicating network reachability, low attack complexity, no privileges, required user interaction, and low integrity impact.
Likely exposure
Exposure is likely limited to macOS endpoints running Chrome versions earlier than 148.0.7778.216. Risk is highest where browser updates are unmanaged, delayed, or users commonly access untrusted web content.
Exploitation context
The sources describe exploitation through a crafted HTML page. There is no KEV listing and no provided source states active exploitation in the wild. Evidence does not support claiming confirmed exploitation.
Researcher notes
The public data is sparse. The Chromium issue is referenced, but no detailed root-cause or exploitability notes are included in the provided bundle. Avoid assuming remote code execution or broader platform impact beyond Chrome on Mac.
Mitigation direction
- Update Chrome on macOS to 148.0.7778.216 or later.
- Verify managed browser update policies cover macOS endpoints.
- Prioritize unmanaged laptops and developer workstations for remediation.
- Check Google Chrome release guidance for any follow-up instructions.
Validation and detection
- Inventory Chrome versions across macOS endpoints.
- Confirm no macOS endpoint runs Chrome earlier than 148.0.7778.216.
- Review browser management tooling for failed or deferred updates.
- Track remediation completion separately for unmanaged devices.
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-787: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-9930 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
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:N/I:L/A:N 2.8 1.4 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
4.3 MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
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/501499832 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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.