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CVE-2026-76957

Quick assessment

Affected
libexpat project libexpat
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.

libexpat 在 2.8.4 版本之前，在使用自定义编码回调时缺乏对处理器调用深度的跟踪。因此可能导致发生Use-After-Free（释放后使用）漏洞。注意：此问题与 CVE-2026-50219、CVE-2026-56131 和 CVE-2026-56412 类似。

CVSS 4.9 · Medium EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat project libexpat < 2.8.4 affected
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I. Basic Information for CVE-2026-76957

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libexpat project libexpat 0 ~ 2.8.4 -

II. Public POCs for CVE-2026-76957

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-76957

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Patches & Fixes for CVE-2026-76957 (2)

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat project
Same weakness: CWE-416

V. Comments for CVE-2026-76957

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