Bug 2520583 (CVE-2026-18303)

Summary: CVE-2026-18303 gimp: GIMP: Remote code execution via TIF file parsing vulnerability
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, a stack-based buffer overflow in the TIF file parsing component, allows a remote attacker to execute arbitrary code. User interaction is required, as the target must open a specially crafted malicious TIF file. The issue stems from insufficient validation of user-supplied data length before copying it to a buffer, leading to potential code execution in the context of the current process.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2521184    
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Description OSIDB Bzimport 2026-08-20 16:54:44 UTC 
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.