CVE-2026-40505: MuPDF before 1.27 contains an ANSI injection vulnerability in mutool that allows attackers to inject arbitrary

Q: How do I fix CVE-2026-40505?

mupdf: upgrade to 1.27.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-40505 being exploited?

CVE-2026-40505 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40505 affect?

CVE-2026-40505 affects mupdf. Severity is low (CVSS 3.3). 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 a

Q: How urgent is CVE-2026-40505?

Priority 13/100. No elevated risk signals yet.

Routine

LOW 3.3UPGRADE

CVE-2026-40505 is a low-severity flaw (CVSS 3.3) affecting mupdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-150
Published	2026-04-16
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: artifex

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-16 02:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

artifex mupdf UPGRADE

Affected: < 1.27.0

Fixed in: 1.27.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mupdf || rpm -q mupdf || mupdf --version

2. UPGRADE to 1.27.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mupdf

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mupdf

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40505?

mupdf: upgrade to 1.27.0. Exact commands for each OS are on this page.

Is CVE-2026-40505 being exploited?

CVE-2026-40505 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40505 affect?

CVE-2026-40505 affects mupdf. Severity is low (CVSS 3.3). 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 a

How urgent is CVE-2026-40505?

Priority 13/100. No elevated risk signals yet.

Related CVEs

CVE-2026-7233 LOW 3.3 UPGRADE A vulnerability was determined in Artifex MuPDF up to 1.28.0

References

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