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CVE-2026-9998: Integer overflow in Skia in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had comprom...

Integer overflow in Skia in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

HighCVSS 8.3Not KEV-listed Updated
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Glexia's Take high

Analyst readout for executives and security teams

Plain-English summary

This is a high-severity Chrome browser flaw. A malicious web page could help an attacker break out of Chrome’s sandbox, but only after the renderer process is already compromised. Business urgency is patching Chrome quickly, especially on endpoints used for email, web access, and privileged administration.

Executive priority

Treat this as a prompt browser patching issue, not a panic event. The flaw has high impact if chained successfully, but the bundle does not provide evidence of active exploitation. Ensure Chrome update compliance is visible and fast.

Technical view

CVE-2026-9998 is an integer overflow in Skia affecting Google Chrome before 148.0.7778.216. The CVSS 3.1 score is 8.3. The attack path is network-based with user interaction and high attack complexity, requiring renderer compromise before potential sandbox escape through crafted HTML.

Likely exposure

Exposure is likely wherever Google Chrome desktop is installed below the fixed version named in the advisory. The source bundle does not identify other products, platforms, or Chromium-based browsers as affected.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. Public detail is limited. The described scenario is serious because sandbox escape can increase impact after a browser-renderer compromise, but the prerequisite lowers confidence in broad standalone exploitation.

Researcher notes

The key technical facts are integer overflow in Skia, crafted HTML, renderer compromise prerequisite, and potential sandbox escape. The Chromium issue may contain limited or restricted detail. Do not assume exploit availability or affected downstream products without additional vendor confirmation.

Mitigation direction

  • Update Google Chrome to 148.0.7778.216 or later where applicable.
  • Confirm managed browser update policies are enforcing the fixed version.
  • Prioritize endpoints used by administrators and high-risk web users.
  • Monitor Google Chrome release notes for follow-up guidance.
  • If patch timing is delayed, review vendor guidance for interim controls.

Validation and detection

  • Inventory Chrome versions across endpoints and VDI images.
  • Flag any Chrome install below 148.0.7778.216.
  • Check vulnerability scanner results against CVE-2026-9998.
  • Verify browser restart completed after update deployment.
  • Review security tooling for browser exploit or sandbox escape alerts.
Prepared
Confidence
medium
Sources
4

Public sources used

Based on public source material and reviewed before publication.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Privilege 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.

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CVE-2026-9998 mapping review

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Vulnerability profile CVE Program record
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

Official CVE source material

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.

1 CVSS vectors
3 Timeline events
1 ADP providers
3 Source links

SSVC decision data

CISA-ADP CISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

1 official score

We 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.

Score Version Severity Vector Exploit Impact Source
8.3 CVSS 3.1 High 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 High
CVSS 3.1 vector shape for CVE-2026-9998 Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reserved CVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE published CVE Program

    The CVE record was published.

  3. CVE updated CVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADP CISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

Vendor Product Version / package Status
Google Chrome 148.0.7778.216 Listed
Weakness

CWE details

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