CVE-2026-111139
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
CVSS Score
5.5
EPSS Score
0.0%
EPSS Percentile
0th
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().
| CWE | CWE-125 |
| Vendor | netsurf |
| Product | libnsbmp |
| Published | Oct 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
NetSurf / libnsbmp
0 ≤ 0.1.7
References
hackmd.io: https://hackmd.io/@haind-pwn/libnsbmp-rle-absolute-pad-and-ico-mask-oob-read github.com: https://github.com/netsurf-browser/libnsbmp/blob/ea063c9f46acb43e90208da14073332b505ef7e7/src/libnsbmp.c#L835-L873 download.netsurf-browser.org: https://download.netsurf-browser.org/libs/releases/libnsbmp-0.1.7-src.tar.gz github.com: https://github.com/netsurf-browser/libnsbmp vulncheck.com: https://www.vulncheck.com/advisories/netsurf-libnsbmp-through-0.1.7-out-of-bounds-read-via-bmp-decode-mask
Credits
HaiND from the Post and Telecommunication Institute of Technology