CVE-2025-11678— Stack-based Buffer Overflow in libwebsockets DNS response parsing
Quick assessment
Affected
warmcat libwebsocket
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是lws-team开源的一个规范的 libwebsockets 网络库。 Libwebsockets存在安全漏洞，该漏洞源于启用LWS_WITH_SYS_ASYNC_DNS标志编译时，lws_adns_parse_label函数存在基于栈的缓冲区溢出，可能导致执行任意代码。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-11678
Vulnerability Information
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Vulnerability Title
Stack-based Buffer Overflow in libwebsockets DNS response parsing
Source: CVE Program / CVE List V5
Vulnerability Description
Stack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Libwebsockets 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Libwebsockets是lws-team开源的一个规范的 libwebsockets 网络库。 Libwebsockets存在安全漏洞，该漏洞源于启用LWS_WITH_SYS_ASYNC_DNS标志编译时，lws_adns_parse_label函数存在基于栈的缓冲区溢出，可能导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| warmcat | libwebsocket | 4.0 ~ 4.4.2 | - |
|
II. Public POCs for CVE-2025-11678
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2025-11678 (1)
Same Patch Batch · warmcat · 2025-10-20 · 4 CVEs total
| CVE-2025-11677 | Use After Free in libwebsockets WebSocket server | |
| CVE-2025-11679 | Out-of-bounds Read in libwebsockets PNG parsing | |
| CVE-2025-11680 | Out-of-bounds Write in libwebsockets PNG parsing |
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V. Comments for CVE-2025-11678
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