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CVE-2026-40505— MuPDF < 1.27 mutool ANSI Injection via Metadata

Quick assessment

Affected
Artifex Software Inc. MuPDF
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.

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存在安全漏洞，该漏洞源于未在将PDF元数据字段写入终端输出前进行清理，允许攻击者通过特制的PDF元数据注入任意ANSI转义序列，可能用于社会工程攻击。

CVSS 3.3 · Low EPSS 0.19% · P7

Affected Version Matrix 2

VendorProduct Version RangeStatus
Artifex Software Inc. MuPDF < 1.27.0 affected
0f17d789fe8c29b41e47663be82514aaca3a4dfb affected
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I. Basic Information for CVE-2026-40505

Vulnerability Information
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Vulnerability Title
MuPDF < 1.27 mutool ANSI Injection via Metadata
Source: CVE Program / CVE List V5
Vulnerability Description
MuPDF before 1.27 contains an ANSI injection vulnerability in mutool that allows attackers to inject arbitrary ANSI escape sequences through crafted PDF metadata fields. Attackers can embed malicious ANSI escape codes in PDF metadata that are passed unsanitized to terminal output when running mutool info, enabling them to manipulate terminal display for social engineering attacks such as presenting fake prompts or spoofed commands.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
转义、元或控制序列转义处理不恰当
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存在安全漏洞，该漏洞源于未在将PDF元数据字段写入终端输出前进行清理，允许攻击者通过特制的PDF元数据注入任意ANSI转义序列，可能用于社会工程攻击。
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
Artifex Software Inc. MuPDF 0 ~ 1.27.0 -

II. Public POCs for CVE-2026-40505

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III. Intelligence Information for CVE-2026-40505

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Patches & Fixes for CVE-2026-40505 (1)

IV. Related Vulnerabilities

Same product: MuPDF
Same vendor: Artifex Software Inc.
Same weakness: CWE-150

V. Comments for CVE-2026-40505

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