[Pkg-gnome-extras-maintainers] Bug#1145894: gimp: CVE-2026-18303

[Salvatore Bonaccorso]

Source: gimp
Version: 3.2.4-3
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for gimp.

CVE-2026-18303[0]:
| GIMP TIF File Parsing Stack-based Buffer Overflow Remote Code
| Execution Vulnerability. This vulnerability allows remote attackers
| to execute arbitrary code on affected installations of GIMP. User
| interaction is required to exploit this vulnerability in that the
| target must visit a malicious page or open a malicious file.  The
| specific flaw exists within the parsing of TIF files. The issue
| results from the lack of proper validation of the length of user-
| supplied data prior to copying it to a stack-based buffer. An
| attacker can leverage this vulnerability to execute code in the
| context of the current process. Was ZDI-CAN-29399.


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-2026-18303
    https://www.cve.org/CVERecord?id=CVE-2026-18303
[1] https://www.zerodayinitiative.com/advisories/ZDI-26-456/
[2] https://gitlab.gnome.org/GNOME/gimp/-/commit/5633b362026c6e5b2beb559a10cd76fa32a47592

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore