Name: CVE-2026-8836: Stack-based Buffer Overflow
Creator: Rapid7
Published: 2026-05-18T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-8836, CWE-119, CWE-121, CVSS 9.8, EPSS 0.01097

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.

CVSS Details

CVSS 4.0 Base Score: 8.9 (HIGH)
CVSS 4.0 Vector: (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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 9.8
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Debian	—	Upgrade lwip	Sep 21, 2026	May 18, 2026
Ubuntu	—	Upgrade liblwip-doc (Ubuntu Pro)Upgrade liblwip-dev (Ubuntu Pro)Upgrade liblwip0t64 (Ubuntu Pro)Upgrade liblwip0 (Ubuntu Pro)	Jun 16, 2026	Jun 11, 2026

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CVSS Details

Covered by Rapid7

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