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CVE-2026-110605— libschrift through 0.10.2 Divide by Zero via unitsPerEm in draw_line

Quick assessment

Affected
tomolt libschrift
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.

libschrift 版本 0.10.2 及之前版本存在一个除以零漏洞，攻击者可以通过提供一个在 head 表中将 unitsPerEm 设置为 0 的字体，导致应用程序崩溃。攻击者还可以构造一个恶意的 TrueType 字体，其 NaN（非数字）字形坐标会绕过 clip_points() 函数的检查，从而在 sft_render() 执行 draw_line() 时引发越界栅格读取，最终导致进程崩溃。

CVSS 5.5 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
tomolt libschrift ≤ 0.10.2 affected
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I. Basic Information for CVE-2026-110605

Vulnerability Information
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Vulnerability Title
libschrift through 0.10.2 Divide by Zero via unitsPerEm in draw_line
Source: CVE Program / CVE List V5
Vulnerability Description
libschrift through 0.10.2 contains a divide by zero vulnerability that allows attackers to crash applications by supplying a font with unitsPerEm of 0 in the head table. Attackers can provide a crafted TrueType font whose NaN glyph coordinates bypass clip_points(), causing an out-of-bounds raster read in draw_line() during sft_render() and crashing the process.
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
除零错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tomolt libschrift 0 ~ 0.10.2 -

II. Public POCs for CVE-2026-110605

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III. Intelligence Information for CVE-2026-110605

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Other References for CVE-2026-110605 (3)

IV. Related Vulnerabilities

Same weakness: CWE-369

V. Comments for CVE-2026-110605

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