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CVE-2026-8836— lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow

Quick assessment

Affected
n/a lwIP
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.

lwip是lwIP Developers开源的一个开源的TCP/IP协议栈实现。 lwip 2.2.1及之前版本存在缓冲区错误漏洞，该漏洞源于snmpv3 USM Handler组件中文件src/apps/snmp/snmp_msg.c的函数snmp_parse_inbound_frame对参数msgAuthenticationParameters的操作导致栈缓冲区溢出，可能允许远程攻击。

CVSS 9.8 · Critical EPSS 1.05% · P61

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
n/a lwIP 2.1.0 affected
2.1.1 affected
2.1.2 affected
2.1.3 affected
2.2.0 affected
2.2.1 affected
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I. Basic Information for CVE-2026-8836

Vulnerability Information
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Vulnerability Title
lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
lwip 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lwip是lwIP Developers开源的一个开源的TCP/IP协议栈实现。 lwip 2.2.1及之前版本存在缓冲区错误漏洞，该漏洞源于snmpv3 USM Handler组件中文件src/apps/snmp/snmp_msg.c的函数snmp_parse_inbound_frame对参数msgAuthenticationParameters的操作导致栈缓冲区溢出，可能允许远程攻击。
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
- lwIP 2.1.0 cpe:2.3:a:lwip:lwip:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8836

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 13793 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-8836

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Patches & Fixes for CVE-2026-8836 (2)

Vendor Advisories for CVE-2026-8836 (2)

Other References for CVE-2026-8836 (1)

Same Patch Batch · n/a · 2026-05-18 · 13 CVEs total

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CVE-2026-41085 Thermo Fisher Scientific Torrent Suite Dx 安全漏洞
CVE-2026-38719 OpENer 缓冲区错误漏洞
CVE-2026-29964 HSC MailInspector 跨站脚本漏洞
CVE-2026-29962 HSC MailInspector 安全漏洞
CVE-2026-29965 HSC MailInspector 跨站脚本漏洞
CVE-2026-29963 HSC MailInspector 安全漏洞

IV. Related Vulnerabilities

Same vendor: n/a
Same weakness: CWE-121

V. Comments for CVE-2026-8836

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