Low severity · published Apr 16, 2026
CVE-2026-40505
MuPDF < 1.27 mutool ANSI Injection via Metadata
3.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MU
MuPDF · Artifex Software Inc.
before 1.27.0; 0f17d789fe8c29b41e47663be82514aaca3a4dfb · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40505
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40505
Patch
https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=0f17d789fe8c29b41e47663be82514aaca3a4dfb
Patch
https://github.com/ArtifexSoftware/mupdf/commit/0f17d789fe8c29b41e47663be82514aaca3a4dfb
Product
https://github.com/ArtifexSoftware/mupdf/releases/tag/1.27.0
Third Party Advisory
https://www.vulncheck.com/advisories/mupdf-mutool-ansi-injection-via-metadata