CVE-2026-84138

Denial-of-service in the PDF Viewer component

Published Sep 1, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-416
CWE-787
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
Weaknesses CWE-400
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Vendors & Products Mozilla thunderbird
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Weaknesses CWE-416
CWE-787
Type Values Removed Values Added
Weaknesses CWE-120
CWE-400
Type Values Removed Values Added
Description Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155. Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
References
Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox
Type Values Removed Values Added
Weaknesses CWE-120
CWE-400
Type Values Removed Values Added
Description Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155.
Title Denial-of-service in the PDF Viewer component
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Sep 3, 2026, 5:24 PM
Reserved
Sep 1, 2026, 7:25 AM
Status
Modified
Published
Sep 1, 2026, 1:20 PM
Modified
Sep 3, 2026, 6:17 PM