Use After Free in Apple macOS
CVE-2026-3777
The application does not properly validate the lifetime and validity of internal view cache pointers after JavaScript changes the document zoom and page state. When a script modifies the zoom property and then triggers a page change, the original view object may be destroyed while stale pointers are still kept and later dereferenced, which under crafted JavaScript and document structures can lead to a use-after-free condition and potentially allow arbitrary code execution.
Vulnerability class: Use-After-Free
EPSS: 0.001 (2.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
Affected products
- Apple Macos
- Foxit Pdf_editor
- Foxit Pdf_reader
- Foxit Software Inc. Pdf Editor — versions Versions 2025.3 and earlier, Versions 14.0.2 and earlier, Versions 13.2.2 and earlier
- Foxit Software Inc. Pdf Reader — versions Versions 2025.3 and earlier
- Microsoft Windows
Weakness classification (CWE)
References
- 14984358-7092-470d-8f34-ade47a7658a2 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-3777?
- CVE-2026-3777 is a medium-severity vulnerability in Apple macOS, classified under Use After Free. CVSS score: 5.5/10. Published 2026-04-01.
- How severe is CVE-2026-3777?
- Medium severity. CVSS v3 base score is 5.5 out of 10.