EUVD-2026-69086
GHSA-qgw4-jqw6-383q
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Network-delivered PDF requires the user to open it (UI:R); no privileges needed; impact is browser-process availability only (A:H), with no confidentiality or integrity consequence.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155.
AnalysisAI
Uncontrolled resource consumption in Mozilla Firefox's built-in PDF Viewer component allows a remote, unauthenticated attacker to crash or hang the browser by inducing a victim to open a specially crafted PDF file. All Firefox releases prior to version 155 are affected, as confirmed by Mozilla Security Advisories MFSA2026-82 and MFSA2026-86. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to be running Mozilla Firefox with the built-in PDF Viewer (pdf.js) active, which is the default configuration - no special settings need to be enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 base score reflects a medium-severity denial-of-service affecting availability only (C:N/I:N/A:H), with no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Mozilla Firefox to version 155 or later; this is the confirmed fix per the CVE description and Mozilla Security Advisory MFSA2026-82 (https://www.mozilla.org/security/advisories/mfsa2026-82/) and MFSA2026-86 (https://www.mozilla.org/security/advisories/mfsa2026-86/). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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