CVE-2026-8836

lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow

State: Published
Severity: 9.3 Critical
Published: May 18, 2026
Updated: Aug 22, 2026
Reserved: May 18, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P	VulDB
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C	VulDB
3.0	9.8 Critical	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C	VulDB
2.0	10.0 High	AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-121 Stack-based Buffer Overflow
CWE-119 Memory Corruption

Affected Products

Product	Versions
lwIPn/a	2.1.0Affected 2.1.1Affected 2.1.2Affected 2.1.3Affected 2.2.0Affected 2.2.1Affected

References

VDB-364474 | lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflowvdb-entrytechnical-description
VDB-364474 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
CVE-2026-8836 | CVE Analysis and Reportthird-party-advisory
Submit #829798 | lwIP 2.1.0 Stack-based Buffer Overflowthird-party-advisory
https://savannah.nongnu.org/bugs/?68055broken-link
https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898cbroken-linkpatch
https://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898cpatch
https://savannah.nongnu.org/bugs/?68194broken-link

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