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CVE-2026-19773— libwebsockets HTTP/2 HPACK Path Header Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

Quick assessment

Affected
libwebsockets libwebsockets
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.

libwebsockets HTTP/2 HPACK Path 头部解析越界写入导致的远程代码执行漏洞。该漏洞允许远程攻击者在受影响的 libwebsockets 安装环境中执行任意代码。利用此漏洞无需进行身份验证。 具体缺陷存在于 HTTP/2 HPACK path 头部的解析过程中。该问题源于对用户提供数据缺乏适当的验证，可能导致写入操作越界，超出已分配缓冲区的末尾。攻击者可利用此漏洞在当前进程的上下文中执行代码。该漏洞编号为 ZDI-CAN-31036。

AI Predicted 9.8 Difficulty: Moderate

Affected Version Matrix 1

VendorProduct Version RangeStatus
libwebsockets libwebsockets b4b5aed3903eaff09cd76a410f69bbe5dff66f8e affected
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I. Basic Information for CVE-2026-19773

Vulnerability Information
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Vulnerability Title
libwebsockets HTTP/2 HPACK Path Header Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
libwebsockets HTTP/2 HPACK Path Header Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of HTTP/2 HPACK path header. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31036.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libwebsockets libwebsockets b4b5aed3903eaff09cd76a410f69bbe5dff66f8e -

II. Public POCs for CVE-2026-19773

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III. Intelligence Information for CVE-2026-19773

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Patches & Fixes for CVE-2026-19773 (1)

Vendor Advisories for CVE-2026-19773 (1)

IV. Related Vulnerabilities

Same product: libwebsockets
Same weakness: CWE-787

V. Comments for CVE-2026-19773

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