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CVE-2026-9960: Integer overflow in PDFium in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compr...

Integer overflow in PDFium in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to execute arbitrary code inside a sandbox via a crafted font file. (Chromium security severity: High)

HighCVSS 7.5Not KEV-listed Updated
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Glexia's Take high

Analyst readout for executives and security teams

Plain-English summary

This Chrome flaw lets a remote attacker, after already compromising the renderer, run code inside Chrome's sandbox using a malicious font file. It is high severity because successful exploitation could affect confidentiality, integrity, and availability, but the sources do not show active exploitation.

Executive priority

Patch on the normal high-severity browser cadence, faster for exposed user workstations and unmanaged devices. Do not treat this as confirmed exploited based on the provided evidence.

Technical view

CVE-2026-9960 is an integer overflow in PDFium in Google Chrome before 148.0.7778.216. The published vector is network reachable, requires user interaction, has high attack complexity, and requires no privileges. The attacker must already have compromised the renderer process.

Likely exposure

Organizations with Google Chrome versions earlier than 148.0.7778.216 are the named exposure. The provided sources do not identify other affected products, platforms, or Chromium-based browsers.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no cited source states active exploitation. The described attack chain requires a compromised renderer and a crafted font file, so it is serious but not a simple standalone browser compromise.

Researcher notes

Key constraints are important: the attacker needs renderer compromise first, and code execution is described as inside the sandbox. The public bundle lacks deeper issue details, exploit evidence, or product scope beyond Google Chrome.

Mitigation direction

  • Update Google Chrome to 148.0.7778.216 or later.
  • Confirm enterprise browser auto-update policies are enabled and functioning.
  • Prioritize unmanaged endpoints and systems with delayed browser patching.
  • Check Google Chrome release guidance for any revised remediation details.

Validation and detection

  • Inventory installed Chrome versions across managed endpoints.
  • Verify Chrome reports version 148.0.7778.216 or later after update.
  • Review browser management logs for failed or deferred updates.
  • Monitor the CVE record and Chrome advisory for exploitation or scope updates.
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

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-9960 mapping review

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Vulnerability profile CVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/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
7.5 CVSS 3.1 High CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H 1.6 5.9 CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5 High
CVSS 3.1 vector shape for CVE-2026-9960 Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/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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CWE mapping pending import

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