CVE-2026-111139: medium-severity vulnerability in NetSurf libnsbmp
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
Published
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.8epss 0.1%
exploitation probability
0.1%top 98% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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().
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
Affected products
NetSurf · libnsbmppublic PoCs found — 1
cve_referencehackmd.io/@haind-pwn/libnsbmp-rle-absolute-pad-and-ico-mask-oob-readunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — NetSurf libnsbmp
In the same product, most dangerous first.
References
https://download.netsurf-browser.org/libs/releases/libnsbmp-0.1.7-src.tar.gzhttps://github.com/netsurf-browser/libnsbmphttps://github.com/netsurf-browser/libnsbmp/blob/ea063c9f46acb43e90208da14073332b505ef7e7/src/libnsbmp.c#L835-L873https://hackmd.io/@haind-pwn/libnsbmp-rle-absolute-pad-and-ico-mask-oob-readhttps://www.vulncheck.com/advisories/netsurf-libnsbmp-through-0.1.7-out-of-bounds-read-via-bmp-decode-mask