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CVE-2026-3776— Null pointer dereference in Foxit PDF Editor/Reader when accessing stamp annotation

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，该漏洞源于访问图章注释资源前未验证所需外观数据的存在，可能导致特制文档触发空指针取消引用，引发应用程序崩溃和拒绝服务。

CVSS 5.5 · Medium EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-3776

Vulnerability Information
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Vulnerability Title
Null pointer dereference in Foxit PDF Editor/Reader when accessing stamp annotation
Source: CVE Program / CVE List V5
Vulnerability Description
The application does not validate the presence of required appearance (AP) data before accessing stamp annotation resources. When a PDF contains a stamp annotation missing its AP entry, the code continues to dereference the associated object without a prior null or validity check, which allows a crafted document to trigger a null pointer dereference and crash the application, resulting in denial of service.
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
空指针解引用
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，该漏洞源于访问图章注释资源前未验证所需外观数据的存在，可能导致特制文档触发空指针取消引用，引发应用程序崩溃和拒绝服务。
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-2026-3776

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III. Intelligence Information for CVE-2026-3776

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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-2026-3777 5.5 MEDIUM Use after free of view cache in Foxit PDF Editor/Reader
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-476

V. Comments for CVE-2026-3776

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