Bug 2520559 (CVE-2026-18309)

Summary: CVE-2026-18309 gimp: GIMP: Remote Code Execution via APNG file parsing integer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in GIMP. This vulnerability allows a remote attacker to execute arbitrary code on affected installations of GIMP. This occurs due to an integer overflow during the parsing of APNG (Animated Portable Network Graphics) files, caused by a lack of proper validation of user-supplied data before allocating a buffer. Successful exploitation requires user interaction, such as opening a malicious file.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2521190    
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Description OSIDB Bzimport 2026-08-20 16:50:31 UTC 
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.