Bug 2561441 (CVE-2026-116723)

Summary: CVE-2026-116723 fltk: fltk: Arbitrary code execution via crafted BMP image file
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 FLTK. This vulnerability allows an attacker to achieve arbitrary code execution or cause a Denial of Service (DoS) by convincing a user to open a specially crafted BMP or ICO image file. The issue occurs due to a stack-based buffer overflow when parsing image headers with an oversized color palette field, leading to memory corruption.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-26 22:32:30 UTC
FLTK through 1.4.5 contains a stack-based buffer overflow vulnerability in Fl_BMP_Image::load_bmp_() that allows attackers to corrupt stack memory by supplying an oversized BMP colors_used field. Attackers can craft BMP or ICO files with colors_used above 256 to overflow the 768-byte colormap array, causing crashes or potential code execution.