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CVE-2026-94283— Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser

Quick assessment

Affected
x.org libX11
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 libX11 1.8.14 版本之前，libX11 中的 XIM（X 输入法）属性解析器存在一个越界读取漏洞。恶意 X 服务器可利用此漏洞导致已连接的 X 客户端崩溃。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-94283

Vulnerability Information
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Vulnerability Title
Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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
x.org libX11 0 ~ 1.8.14 -

II. Public POCs for CVE-2026-94283

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III. Intelligence Information for CVE-2026-94283

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Other References for CVE-2026-94283 (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-2026-94282 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-2026-94287 5.5 MEDIUM Denial of service via unsigned underflow in libXpm's write path
CVE-2026-94285 5.1 MEDIUM Out-of-bounds read in libX11's byte-oriented codeset parser

IV. Related Vulnerabilities

Same product: libX11
Same vendor: x.org
Same weakness: CWE-125

V. Comments for CVE-2026-94283

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