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CVE-2026-109088— libXtst RECORD EnableContext Reply Endless Loop

Quick assessment

Affected
X.org libXtst
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.

恶意的 X 服务器可以发送格式错误的 响应，导致使用 libXtst 1.2.6 之前版本中 函数的 X 客户端进入无限循环。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-109088

Vulnerability Information
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Vulnerability Title
libXtst RECORD EnableContext Reply Endless Loop
Source: CVE Program / CVE List V5
Vulnerability Description
A malicious X server could send malformed  RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
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
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
X.org libXtst 0 ~ 1.2.6 -

II. Public POCs for CVE-2026-109088

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III. Intelligence Information for CVE-2026-109088

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Other References for CVE-2026-109088 (1)

Same Patch Batch · X.org · 2026-10-27 · 4 CVEs total

CVE-2026-88812 7.8 HIGH X.Org Server XKB SetGeometry TextDoodad Double Free
CVE-2026-109089 7.5 HIGH libXi XGetDeviceControl Control Type Mismatch Heap Buffer Overflow
CVE-2026-109090 7.5 HIGH libXi XGetDeviceControl DEVICE_ENABLE Heap Buffer Overflow

IV. Related Vulnerabilities

Same product: libXtst
Same vendor: X.org
Same weakness: CWE-835