Hi,

The following vulnerability was published for gimp.

CVE-2026-66759[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-66759
https://www.cve.org/CVERecord?id=CVE-2026-66759
[1] https://gitlab.gnome.org/GNOME/gimp/-/issues/16528
[2] https://gitlab.gnome.org/GNOME/gimp/-/commit/abb3129a8ecb79bf3af6df03bc35ddf8f7aaba20

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore