CVE-2026-111139CWE-125

CVE-2026-111139

Medium · published October 15, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
2.4
In the wild
Unconfirmed
What it is

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().

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
6.8 · 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
EPSS
0.00130 · 2.4th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-10-15T23:17Z
References (5)
https://download.netsurf-browser.org/libs/releases/libnsbmp-0.1.7-src.tar.gz · [email protected]https://github.com/netsurf-browser/libnsbmp · [email protected]https://github.com/netsurf-browser/libnsbmp/blob/ea063c9f46acb43e90208da14073332b505ef7e7/src/libnsbmp.c#L835-L873 · [email protected]https://hackmd.io/@haind-pwn/libnsbmp-rle-absolute-pad-and-ico-mask-oob-read · [email protected]https://www.vulncheck.com/advisories/netsurf-libnsbmp-through-0.1.7-out-of-bounds-read-via-bmp-decode-mask · [email protected]
EPSS history
Timeline
  • 17 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 15 OCT 18:57Z
    NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
    cvelistv5
  • 15 OCT 18:57Z
    NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
    cvelistv5