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CVE-2026-3777— Use after free of view cache in Foxit PDF Editor/Reader

Quick assessment

Affected
Foxit Software Inc. Foxit PDF Editor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Foxit PDF Reader和Foxit PDF Editor都是中国福昕（Foxit）公司的产品。Foxit PDF Reader是一款PDF阅读器。Foxit PDF Editor是一款PDF编辑器。 Foxit PDF Reader和Foxit PDF Editor存在安全漏洞，该漏洞源于JavaScript更改文档缩放和页面状态后未正确验证内部视图缓存指针的生命周期和有效性，可能导致释放后重用，并可能允许任意代码执行。

CVSS 5.5 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-3777

Vulnerability Information
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Vulnerability Title
Use after free of view cache in Foxit PDF Editor/Reader
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Foxit PDF Reader和Foxit PDF Editor 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Foxit PDF Reader和Foxit PDF Editor都是中国福昕（Foxit）公司的产品。Foxit PDF Reader是一款PDF阅读器。Foxit PDF Editor是一款PDF编辑器。 Foxit PDF Reader和Foxit PDF Editor存在安全漏洞，该漏洞源于JavaScript更改文档缩放和页面状态后未正确验证内部视图缓存指针的生命周期和有效性，可能导致释放后重用，并可能允许任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Foxit Software Inc. Foxit PDF Editor Versions 2025.3 and earlier -
Foxit Software Inc. Foxit PDF Reader Versions 2025.3 and earlier -

II. Public POCs for CVE-2026-3777

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III. Intelligence Information for CVE-2026-3777

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Same Patch Batch · Foxit Software Inc. · 2026-04-01 · 8 CVEs total

CVE-2026-3775 7.8 HIGH Foxit PDF Editor/Reader Update Service Uncontrolled Search Path Element Local Privilege Es
CVE-2026-3779 7.8 HIGH Foxit PDF Editor/Reader List Box Calculate Array Use-After-Free Vulnerability
CVE-2026-3780 7.3 HIGH Foxit PDF Editor/Reader Installer Uncontrolled Search Path Privilege Escalation
CVE-2026-4947 7.1 HIGH Insecure Direct Object Reference (IDOR) Leading to Signature Forgery in Foxit eSign
CVE-2026-3778 6.2 MEDIUM Stack exhaustion caused by cyclic references in Foxit PDF Editor/Reader
CVE-2026-3776 5.5 MEDIUM Null pointer dereference in Foxit PDF Editor/Reader when accessing stamp annotation
CVE-2026-3774 4.7 MEDIUM Self-Modifications Affecting Altered Printing and Redaction in Foxit PDF Editor

IV. Related Vulnerabilities

Same product: Foxit PDF Editor
Same vendor: Foxit Software Inc.
Same weakness: CWE-416

V. Comments for CVE-2026-3777

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