CVE-2026-3308 CVE-2026-3308
An integer overflow in MuPDF allows attackers to execute arbitrary code via a maliciously crafted PDF file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-3308?
CVE-2026-3308 is a high-severity vulnerability in Artifex Software Inc. *PyMuPDF* MuPDF, published on 31 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
An integer overflow vulnerability in 'pdf-image.c' in Artifex's MuPDF version 1.27.0 allows an attacker to maliciously craft a PDF that can trigger an integer overflow within the 'pdf_load_image_imp' function. This allows a heap out-of-bounds write that could be exploited for arbitrary code execution.
Weakness: CWE-190
Which versions are affected by CVE-2026-3308?
How do I fix CVE-2026-3308?
Upgrade to a fixed version.
Is CVE-2026-3308 being exploited?
There is no known exploitation of CVE-2026-3308 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-3308, GHSA-6jrq-hjxp-2x5r, UBUNTU-CVE-2026-3308.