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CVE-2026-76956

Quick assessment

Affected
libexpat project libexpat
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 libexpat 2.8.2 和 2.8.3 版本（未更新至 2.8.4）中，对 返回值的错误解读会导致熵值不足，从而易受哈希泛洪攻击的影响，攻击者可通过构造恶意 XML 内容导致拒绝服务（DoS）。

CVSS 5.9 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat project libexpat 2.8.2< 2.8.4 affected
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I. Basic Information for CVE-2026-76956

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未预期的状态编码或返回值
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libexpat project libexpat 2.8.2 ~ 2.8.4 -

II. Public POCs for CVE-2026-76956

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 13312 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-76956

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Patches & Fixes for CVE-2026-76956 (2)

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat project
Same weakness: CWE-394

V. Comments for CVE-2026-76956

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