Vulnerability Description
A flaw was found in the file-icns plugin in GIMP. When applying a decompressed mask during ICNS image processing, the plugin reads from the mask data buffer without verifying if the cursor exceeds the allocated resource size. If a crafted file contains a truncated mask resource, the icns_decompress function continues reading past the bounds of the buffer. This out-of-bounds read vulnerability results in information disclosure of heap contents, where memory contents are leaked as alpha channel pixel values, or a crash leading to a denial of service if unmapped memory is accessed.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gimp | Gimp | 3.0.8 |
| Redhat | Enterprise Linux | 6.0 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:50817Issue Tracking
- https://access.redhat.com/security/cve/CVE-2026-66759Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2507557Issue TrackingVendor Advisory
- https://gitlab.gnome.org/GNOME/gimp/-/issues/16528ExploitIssue TrackingVendor Advisory
- https://gitlab.gnome.org/GNOME/gimp/-/issues/16528ExploitIssue TrackingVendor Advisory
FAQ
What is CVE-2026-66759?
CVE-2026-66759 is a vulnerability with a CVSS score of 7.1 (HIGH). A flaw was found in the file-icns plugin in GIMP. When applying a decompressed mask during ICNS image processing, the plugin reads from the mask data buffer without verifying if the cursor exceeds the...
How severe is CVE-2026-66759?
CVE-2026-66759 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66759?
Check the references section above for vendor advisories and patch information. Affected products include: Gimp Gimp, Redhat Enterprise Linux.