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CVE-2026-94287— Denial of service via unsigned underflow in libXpm's write path

Quick assessment

Affected
x.org libXpm
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 libXpm 3.5.19 版本之前，libXpm 的写入路径中存在一个因无符号下溢导致的拒绝服务漏洞。本地攻击者可利用该漏洞，导致系统出现无限制的 CPU 使用率和内存耗尽问题。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-94287

Vulnerability Information
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Vulnerability Title
Denial of service via unsigned underflow in libXpm's write path
Source: CVE Program / CVE List V5
Vulnerability Description
A denial of service via unsigned underflow in libXpm's write path in libXpm before 3.5.19 could be used by local attackers to cause unbounded CPU usage and memory exhaustion.
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
循环内过多的平台资源消耗
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
x.org libXpm 0 ~ 3.5.19 -

II. Public POCs for CVE-2026-94287

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III. Intelligence Information for CVE-2026-94287

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Other References for CVE-2026-94287 (1)

Same Patch Batch · x.org · 2026-09-28 · 6 CVEs total

CVE-2026-94286 7.1 HIGH Out-of-bounds read in libXtst's RECORD reply parser
CVE-2026-94283 6.5 MEDIUM Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser
CVE-2026-94282 5.6 MEDIUM Out-of-bounds read in libXi's XI2 enter/leave/focus cookie conversion
CVE-2026-94284 5.5 MEDIUM Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registrati
CVE-2026-94285 5.1 MEDIUM Out-of-bounds read in libX11's byte-oriented codeset parser

IV. Related Vulnerabilities

Same product: libXpm
Same vendor: x.org
Same weakness: CWE-1050

V. Comments for CVE-2026-94287

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