Bug 2539572 (CVE-2026-96544)

Summary: CVE-2026-96544 gimp: gimp: integer overflow in the PVR image loader leads to an out-of-bounds heap read
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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An integer overflow flaw was found in GIMP's PVR image loader. When a user opens a crafted PVR image, unchecked multiplication of attacker-controlled dimensions in pvr_decode_rect() can result in an undersized heap allocation followed by an out-of-bounds read. This may disclose adjacent heap contents through the decoded image or crash the file-pvr plug-in.
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Bug Depends On: 2539573    
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Description OSIDB Bzimport 2026-09-23 17:26:28 UTC 
An integer overflow flaw was found in GIMP's PVR image loader. In pvr_decode_rect(), the PVR image width and height are promoted to signed int and multiplied when calculating the input and pixel-buffer allocation sizes. Crafted dimensions can overflow these calculations and produce small allocations, while gegl_buffer_set() is subsequently given the original large dimensions and reads far beyond the undersized pixel buffer. Heap contents following the buffer can be copied into the decoded image, potentially disclosing process memory, or the file-pvr plug-in can crash when the read reaches unmapped memory. The issue was reproduced with AddressSanitizer in GIMP 3.2.6, and the same code was present in the main branch. Versions 3.2.0 and later are affected. This is a follow-up to CVE-2026-62439: that fix added checked multiplication to pvr_decode_compressed(), but left the equivalent calculations in pvr_decode_rect() unchanged. A patch was available, but no fixed release had been identified at the time of reporting.