CVE-2026-9887

chromium-browser: Use after free in Proxy

Published May 28, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Description
Use after free in Proxy in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code via a crafted PAC script. (Chromium security severity: Critical)

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6316-1 chromium security update
History
Type Values Removed Values Added
First Time appeared Apple
Apple macos
Linux
Linux linux Kernel
Microsoft
Microsoft windows
CPEs cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Vendors & Products Apple
Apple macos
Linux
Linux linux Kernel
Microsoft
Microsoft windows
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Title Use‑after‑free in Chrome Proxy Enables Remote Code Execution via Crafted PAC Script chromium-browser: Use after free in Proxy
Weaknesses CWE-825
References
Metrics threat_severity

None

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Critical

Type Values Removed Values Added
Title Use‑after‑free in Chrome Proxy Enables Remote Code Execution via Crafted PAC Script
Type Values Removed Values Added
First Time appeared Google
Google chrome
Vendors & Products Google
Google chrome
Type Values Removed Values Added
Description Use after free in Proxy in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code via a crafted PAC script. (Chromium security severity: Critical)
Weaknesses CWE-416
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
Chrome
Published
Updated
May 30, 2026, 3:57 AM
Reserved
May 28, 2026, 5:24 PM
Status
Analyzed
Published
May 28, 2026, 11:16 PM
Modified
Jul 21, 2026, 11:10 AM
Severity
Critical
Public date
May 27, 2026, 12:00 AM