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CVE-2026-110601— libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF

Quick assessment

Affected
saitoha libsixel
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.

在 libsixel 1.8.7-r1 之前版本以及 1.9.0 至 1.10.5 版本中，src/fromgif.c 文件里的 gif_init_frame() 函数存在堆越界写入漏洞。该函数未对 GIF 的透明颜色索引与调色板大小进行边界检查。攻击者可构造包含小颜色表和较大透明索引的恶意 GIF 图像，并在启用背景色处理的情况下加载该图像，从而导致在调色板缓冲区之后写入数据，引发堆损坏或程序崩溃。

CVSS 6.3 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
saitoha libsixel < 1.8.7-r1 affected
1.9.0≤ 1.10.5 affected
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I. Basic Information for CVE-2026-110601

Vulnerability Information
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Vulnerability Title
libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF
Source: CVE Program / CVE List V5
Vulnerability Description
libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 contains a heap out-of-bounds write vulnerability in gif_init_frame() in src/fromgif.c, which never checks the GIF transparent color index against the palette size. Attackers can supply a crafted GIF with a small color table and large transparent index, processed with a background color set, to write bytes past the palette buffer, causing heap corruption or crashes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
saitoha libsixel 0 ~ 1.8.7-r1 -

II. Public POCs for CVE-2026-110601

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-110601

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Patches & Fixes for CVE-2026-110601 (1)

Other References for CVE-2026-110601 (5)

IV. Related Vulnerabilities

Same product: libsixel
Same vendor: saitoha
Same weakness: CWE-787

V. Comments for CVE-2026-110601

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