CVE-2026-111139
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
NetSurf libnsbmp
CVSS
6.8MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.13%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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().
Text from CVE List
Affected versions 1
- libnsbmpaffected: all versions through 0.1.7CVE List
References 5
- vulncheck.com/advisories/netsurf-libnsbmp-through-0.1.7-out-of-bounds-read-via-bmp-decode-maskAdvisoryvia CVE List
- hackmd.io/@haind-pwn/libnsbmp-rle-absolute-pad-and-ico-mask-oob-readExploitvia CVE List
- github.com/netsurf-browser/libnsbmp/blob/ea063c9f46acb43e90208da14073332b505ef7e7/src/libnsbmp.c#L835-L873Referencevia CVE List
- download.netsurf-browser.org/libs/releases/libnsbmp-0.1.7-src.tar.gzReferencevia CVE List
- github.com/netsurf-browser/libnsbmpReferencevia CVE List