CVE-2026-78465

Description

A flaw was found in the file-pcx plugin in GIMP, affecting 32-bit builds only. When processing a PCX image file, the plugin calculates memory allocation sizes based on the image dimensions and the number of color planes. If a crafted file sets the number of planes to 4 alongside sufficiently large dimensions, the calculation exceeds the 32-bit integer limit and overflows, resulting in an undersized heap-based buffer allocation. This integer overflow issue results in a heap-based buffer overflow when the plugin subsequently writes image data into the undersized buffer, causing memory corruption, potentially leading to arbitrary code execution or a denial of service.

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Produits concernés

• GNOME GIMP
• Red Hat Enterprise Linux 6
• Red Hat Enterprise Linux 7
• Red Hat Enterprise Linux 8
• Red Hat Enterprise Linux 9
• Gimp gimp

Scores CVSS

Faiblesses (CWE)

• CWE-190

Références

• https://access.redhat.com/security/cve/CVE-2026-78465 Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2522057 Issue TrackingVendor Advisory
• https://gitlab.gnome.org/GNOME/gimp/-/work_items/16578 Issue TrackingVendor AdvisoryExploitMitigation
• https://gitlab.gnome.org/GNOME/gimp/-/work_items/16578 Issue TrackingVendor AdvisoryExploitMitigation

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories