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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: gimp: CVE-2026-18309
Message-ID: <178784241077.341894.16201299826601908333.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Thu, 27 Aug 2026 16:53:30 +0200
Delivered-To: submit@bugs.debian.org

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

Hi,

The following vulnerability was published for gimp.

CVE-2026-18309[0]:
| GIMP APNG File Parsing Integer 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 APNG files. The issue results from the
| lack of proper validation of user-supplied data, which can result in
| an integer overflow before allocating a buffer. An attacker can
| leverage this vulnerability to execute code in the context of the
| current process. Was ZDI-CAN-29401.


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-2026-18309
    https://www.cve.org/CVERecord?id=CVE-2026-18309
[1] https://www.zerodayinitiative.com/advisories/ZDI-26-462/
[2] https://gitlab.gnome.org/GNOME/gimp/-/commit/c760c8309d18bdf5259f1e04ced0779462c7c636

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]