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CVE-2026-111139— NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask

Quick assessment

Affected
NetSurf libnsbmp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NetSurf libnsbmp 0.1.7 及之前版本中，bmp_decode_mask() 函数存在一个越界读取漏洞。攻击者可以通过提供精心构造的 ICO 文件，实现读取图像缓冲区之后的一字节数据。当提供的 ICO 文件内部位图宽度不是 8 的倍数时，会导致堆上的越界读取，从而可能使调用 bmp_decode() 的应用程序崩溃。

CVSS 5.5 · Medium EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
NetSurf libnsbmp ≤ 0.1.7 affected
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I. Basic Information for CVE-2026-111139

Vulnerability Information
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Vulnerability Title
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read via bmp_decode_mask
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
NetSurf libnsbmp 0 ~ 0.1.7 -

II. Public POCs for CVE-2026-111139

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III. Intelligence Information for CVE-2026-111139

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Vendor Advisories for CVE-2026-111139 (1)

Security Blog Posts for CVE-2026-111139 (1)

Other References for CVE-2026-111139 (1)

IV. Related Vulnerabilities

Same product: libnsbmp
Same vendor: NetSurf
Same weakness: CWE-125

V. Comments for CVE-2026-111139

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