{"id":"UBUNTU-CVE-2026-111139","details":"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().","modified":"2026-10-17T12:58:04.153696925Z","published":"2026-10-16T00:00:00Z","upstream":["CVE-2026-111139"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-111139"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-111139"},{"type":"REPORT","url":"https://download.netsurf-browser.org/libs/releases/libnsbmp-0.1.7-src.tar.gz"},{"type":"REPORT","url":"https://github.com/netsurf-browser/libnsbmp"},{"type":"REPORT","url":"https://github.com/netsurf-browser/libnsbmp/blob/ea063c9f46acb43e90208da14073332b505ef7e7/src/libnsbmp.c#L835-L873"},{"type":"REPORT","url":"https://hackmd.io/@haind-pwn/libnsbmp-rle-absolute-pad-and-ico-mask-oob-read"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/netsurf-libnsbmp-through-0.1.7-out-of-bounds-read-via-bmp-decode-mask"}],"affected":[{"package":{"name":"libnsbmp","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libnsbmp?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.1-1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnsbmp0","binary_version":"0.0.1-1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-111139.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}