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CVE-2026-78161— warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_cbor out-of-bounds write

Quick assessment

Affected
warmcat 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.

warmcat libwebsockets是warmcat个人开发者的一个实现WebSocket协议的库。 warmcat libwebsockets 4.5.0版本存在缓冲区错误漏洞，该漏洞源于LECP CBOR Recording组件的lib/misc/lecp.c文件中的report_raw_cbor函数存在越界写入，可能导致远程攻击者利用该漏洞。

CVSS 7.3 · High EPSS 0.40% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
warmcat libwebsockets 4.5.0 affected
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I. Basic Information for CVE-2026-78161

Vulnerability Information
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Vulnerability Title
warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_cbor out-of-bounds write
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in warmcat libwebsockets 4.5.0. Impacted is the function report_raw_cbor of the file lib/misc/lecp.c of the component LECP CBOR Recording. The manipulation results in out-of-bounds write. The attack can be launched remotely. The exploit has been made public and could be used. The patch is identified as 1d44554a1bb262db63ff4e240152a9deecd99054. It is best practice to apply a patch to resolve this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
warmcat libwebsockets 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
warmcat libwebsockets是warmcat个人开发者的一个实现WebSocket协议的库。 warmcat libwebsockets 4.5.0版本存在缓冲区错误漏洞，该漏洞源于LECP CBOR Recording组件的lib/misc/lecp.c文件中的report_raw_cbor函数存在越界写入，可能导致远程攻击者利用该漏洞。
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 libwebsockets 4.5.0 cpe:2.3:a:warmcat:libwebsockets:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-78161

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III. Intelligence Information for CVE-2026-78161

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Patches & Fixes for CVE-2026-78161 (1)

Vendor Advisories for CVE-2026-78161 (1)

Proof of Concept for CVE-2026-78161 (2)

News Coverage for CVE-2026-78161 (2)

IV. Related Vulnerabilities

Same product: libwebsockets
Same vendor: warmcat
Same weakness: CWE-787