CVE-2026-9958: Use after free in PDFium

Published Apr 20, 2026
·
Updated

Chromium: CVE-2026-9958 Use after free in PDFium

Other sources

This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.

— Microsoft

Use after free in PDFium in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to potentially exploit heap corruption via a crafted PDF file. (Chromium security severity: High)

— MITRE

Credit

Google

Affected Software

9 affected componentsFixes available
Google Google Chrome<148.0.7778.216
Google Chrome<148.0.7778.216
148.0.7778.216
All of the following
Google Chrome<148.0.7778.216
Microsoft Windows
All of the following
Google Chrome<148.0.7778.215
Any of the following
Apple macOS
Linux Linux kernel
Microsoft Edge (Chromium-based)
Patch available
Microsoft Edge<148.0.3967.96

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 148.0.7778.216
  2. Upgrade

    Upgrade Chromium / Google Chrome (PDFium) to a version that resolves this vulnerability.

    Fixed in 148.0.7778.216
  3. Compensating control

    Mitigate by blocking or sanitizing inbound PDF files until the browser is updated to address CVE-2026-9958 (use-after-free in PDFium).

Event History

Apr 20, 2026
CVE Published
12:00 AM
Data Sourced
12:00 AM
SeverityWeaknessAffected Software
May 28, 2026
CVE Published
via MITRE·10:25 PM
Data Sourced
via MITRE·10:25 PM
DescriptionWeakness
Data Sourced
via NVD·11:16 PM
DescriptionSeverityWeaknessAffected Software
May 29, 2026
Data Sourced
via Microsoft·11:20 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·11:20 PM
DescriptionAffected Software
Jun 29, 58424
Event
via FIRST·04:32 PM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-9958?

CVE-2026-9958 has a high severity rating of 8.8 according to the CVSS score.

2

How do I fix CVE-2026-9958?

To fix CVE-2026-9958, update Google Chrome to version 148.0.7778.216 or later.

3

What type of vulnerability is CVE-2026-9958?

CVE-2026-9958 is classified as a 'Use After Free' vulnerability in PDFium.

4

Which software is affected by CVE-2026-9958?

CVE-2026-9958 affects Google Chrome and Microsoft Edge (Chromium-based) browsers.

5

Is CVE-2026-9958 exploitable remotely?

Yes, CVE-2026-9958 is exploitable remotely,

Company

Resources

Contact

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