CVE-2026-18303

A flaw was found in GIMP. This vulnerability, a stack-based buffer overflow in the TIF file parsing component, allows a remote attacker to execute arbitrary code. User interaction is required, as the target must open a specially crafted malicious TIF file. The issue stems from insufficient validation of user-supplied data length before copying it to a buffer, leading to potential code execution in the context of the current process.

This vulnerability is rated as Important severity because successful exploitation can allow arbitrary code execution with the privileges of the logged-in user, potentially compromising local files and user data. In Red Hat Enterprise Linux, GIMP is an optional interactive image manipulation utility rather than a background network service, limiting exposure to active user sessions. Triggering the flaw requires a user to manually open an untrusted, specially crafted TIFF image.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this vulnerability, users should avoid opening TIF image files from untrusted or unknown sources. As this flaw requires user interaction to open a malicious file, exercising caution with file origins can prevent exploitation.