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CVE-2026-111138— NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read in RLE8 and RLE4 Decoders

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 在 0.1.7 版本及之前的版本中存在一个越界读取漏洞，该漏洞位于 bmp_decode_rle8() 和 bmp_decode_rle4() 函数中。原因是绝对运行模式的边界检查遗漏了对字节对齐填充字节的处理。攻击者可以通过构造一个以奇数长度的绝对运行结束的 RLE8 或 RLE4 格式的 BMP 图片，导致堆越界读取一个字节，从而致使解码不可信图片的应用程序崩溃。

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-2026-111138

Vulnerability Information
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Vulnerability Title
NetSurf libnsbmp through 0.1.7 Out-of-Bounds Read in RLE8 and RLE4 Decoders
Source: CVE Program / CVE List V5
Vulnerability Description
NetSurf libnsbmp through 0.1.7 contains an out-of-bounds read vulnerability in bmp_decode_rle8() and bmp_decode_rle4() because absolute-run bound checks omit the word-alignment pad byte. Attackers can supply a crafted RLE8 or RLE4 BMP ending on an odd-length absolute run to cause a one-byte heap over-read, crashing applications decoding untrusted images.
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-2026-111138

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III. Intelligence Information for CVE-2026-111138

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Vendor Advisories for CVE-2026-111138 (1)

Security Blog Posts for CVE-2026-111138 (1)

Other References for CVE-2026-111138 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-111138

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