CVE-2026-111139

NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask

Published Oct 15, 2026 CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed
Description
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().

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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().
Title NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
First Time appeared Netsurf-browser
Netsurf-browser libnsbmp
Weaknesses CWE-125
CPEs cpe:2.3:a:netsurf-browser:libnsbmp:*:*:*:*:*:*:*:*
Vendors & Products Netsurf-browser
Netsurf-browser libnsbmp
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 26, 2026, 2:04 PM
Reserved
Oct 15, 2026, 5:03 PM
Status
Deferred
Published
Oct 15, 2026, 7:17 PM
Modified
Oct 26, 2026, 3:16 PM