Bug 2455804 (CVE-2026-35444)

Summary: CVE-2026-35444 SDL_image: SDL_image: Information disclosure via crafted XCF files
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in SDL_image, a library used for loading various image formats. A remote attacker could exploit this vulnerability by enticing a user to open a specially crafted .xcf image file. This flaw, specifically a heap out-of-bounds read, occurs because pixel index values from decoded XCF tile data are used directly as colormap indices without proper validation. Successful exploitation could lead to the disclosure of sensitive information from the heap memory.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2455888, 2455889, 2455890, 2455891    
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Description OSIDB Bzimport 2026-04-06 22:02:47 UTC 
SDL_image is a library to load images of various formats as SDL surfaces. In do_layer_surface() in src/IMG_xcf.c, pixel index values from decoded XCF tile data are used directly as colormap indices without validating them against the colormap size (cm_num). A crafted .xcf file with a small colormap and out-of-range pixel indices causes heap out-of-bounds reads of up to 762 bytes past the colormap allocation. Both IMAGE_INDEXED code paths are affected (bpp=1 and bpp=2). The leaked heap bytes are written into the output surface pixel data, making them potentially observable in the rendered image. This vulnerability is fixed with commit 996bf12888925932daace576e09c3053410896f8.