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CVE-2026-56001— libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow

Quick assessment

Affected
X.Org libXfont2
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.

libXfont libXfont是libXfont团队的一款处理X Window系统字体的库。 libXfont 2.0.8之前版本存在缓冲区错误漏洞，该漏洞源于32位大小溢出导致的BitmapScaleBitmaps中的堆缓冲区溢出，可能被能够访问X Server的攻击者利用在X Server过程中执行代码。

CVSS 8.5 · High EPSS 0.62% · P48

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
X.Org libXfont2 < 2.0.8 affected
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I. Basic Information for CVE-2026-56001

Vulnerability Information
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Vulnerability Title
libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
libXfont 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libXfont libXfont是libXfont团队的一款处理X Window系统字体的库。 libXfont 2.0.8之前版本存在缓冲区错误漏洞，该漏洞源于32位大小溢出导致的BitmapScaleBitmaps中的堆缓冲区溢出，可能被能够访问X Server的攻击者利用在X Server过程中执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
X.Org libXfont2 0 ~ 2.0.8 -

II. Public POCs for CVE-2026-56001

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III. Intelligence Information for CVE-2026-56001

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Patches & Fixes for CVE-2026-56001 (1)

Mailing List Discussions for CVE-2026-56001 (1)

Same Patch Batch · X.Org · 2026-07-08 · 5 CVEs total

CVE-2026-55999 8.5 HIGH xorg-server / xwayland glamor font atlas Heap Buffer Overflow
CVE-2026-56002 8.5 HIGH libXfont2 PCF Font Parsing Heap Buffer Overflow
CVE-2026-56003 8.5 HIGH libXfont2 computeProps Property Buffer Heap Buffer Overflow
CVE-2026-56000 xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()

IV. Related Vulnerabilities

Same product: libXfont2
Same vendor: X.Org
Same weakness: CWE-122

V. Comments for CVE-2026-56001

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