Bug 2553711 (CVE-2026-111139)

Summary: CVE-2026-111139 libnsbmp: libnsbmp: Denial of Service via crafted ICO file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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 libnsbmp. This vulnerability allows an attacker to cause a Denial of Service (DoS) by tricking an application into processing a specially crafted icon (ICO) file. Due to improper bounds checking when decoding mask data for an image whose bitmap width is not an expected multiple of eight, the library reads memory past the allocated buffer. This out-of-bounds read can cause the application using the library to crash unexpectedly.
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Bug Depends On: 2554227    
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Description OSIDB Bzimport 2026-10-15 19:15:18 UTC 
NetSurf libnsbmp through 0.1.7 contains an out-of-bounds read vulnerability in bmp_decode_mask() that allows attackers to read one byte past the image buffer by supplying crafted ICO files. Attackers can provide an ICO whose inner bitmap width is not a multiple of 8, causing a heap over-read that can crash applications calling bmp_decode().