MuPDF mutool ANSI Injection via Metadata_CVE-2026-40505

4.8 / 10

MEDIUM

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Description

MuPDF mutool does not sanitize PDF metadata fields before writing them to terminal output, allowing attackers to inject arbitrary ANSI escape sequences through crafted PDF metadata. Attackers can embed malicious ANSI escape codes in PDF metadata that are passed unsanitized to the terminal when running mutool info, enabling them to clear the terminal display and render arbitrary text for social engineering attacks such as presenting fake prompts or spoofed commands.

Basic Information

ID CVE-2026-40505

Source VulnCheck

Published Apr 16, 2026 at 01:20

Modified Apr 16, 2026 at 01:21

Affected Product

Vendor Artifex Software Inc.

Product MuPDF

Affected Versions Artifex Software Inc. MuPDF 0

CWE Classification

CWE-150

References

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    "lastseen": "",
    "description": "MuPDF mutool does not sanitize PDF metadata fields before writing them to terminal output, allowing attackers to inject arbitrary ANSI escape sequences through crafted PDF metadata. Attackers can embed malicious ANSI escape codes in PDF metadata that are passed unsanitized to the terminal when running mutool info, enabling them to clear the terminal display and render arbitrary text for social engineering attacks such as presenting fake prompts or spoofed commands.",
    "published": "2026-04-16T01:20:08.397Z",
    "modified": "2026-04-16T01:21:45.703Z",
    "type": "cve",
    "title": "MuPDF mutool ANSI Injection via Metadata",
    "source": "VulnCheck",
    "references": "https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=0f17d789fe8c29b41e47663be82514aaca3a4dfb\nhttps://www.vulncheck.com/advisories/mupdf-mutool-ansi-injection-via-metadata",
    "id": "CVE-2026-40505",
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    "cwe": [
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    "sourceData": "Artifex Software Inc. MuPDF 0",
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    "cvss": {
        "score": 4.8,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
        "version": "4.0"
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        "cvssV3": {
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    "href": "",
    "category_name": "CVE",
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    "product": "MuPDF",
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