CVE-2025-55780
Quick assessment
Affected
n/a n/a
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
MuPDF是MuPDF开源的一款以 C 语言编写的自由及开放源代码软件库。用以渲染页面为位图，但也提供对其他操作诸如搜索和列举目录和链接的支持。 MuPDF 1.26.4版本存在安全漏洞，该漏洞源于break_word_for_overflow_wrap函数未检查node->next有效性，可能导致空指针取消引用。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-55780
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A null pointer dereference occurs in the function break_word_for_overflow_wrap() in MuPDF 1.26.4 when rendering a malformed EPUB document. Specifically, the function calls fz_html_split_flow() to split a FLOW_WORD node, but does not check if node->next is valid before accessing node->next->overflow_wrap, resulting in a crash if the split fails or returns a partial node chain.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
MuPDF 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MuPDF是MuPDF开源的一款以 C 语言编写的自由及开放源代码软件库。用以渲染页面为位图，但也提供对其他操作诸如搜索和列举目录和链接的支持。 MuPDF 1.26.4版本存在安全漏洞，该漏洞源于break_word_for_overflow_wrap函数未检查node->next有效性，可能导致空指针取消引用。
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 |
|---|---|---|---|---|
| - | n/a | n/a | - |
|
II. Public POCs for CVE-2025-55780
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Null Pointer De-reference in MUPDF 1.26.4 | https://github.com/ISH2YU/CVE-2025-55780 | POC Details |
AI-Generated POC
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Proof of Concept for CVE-2025-55780 (1)
Same Patch Batch · n/a · 2025-09-23 · 15 CVEs total
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IV. Related Vulnerabilities
V. Comments for CVE-2025-55780
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