Bug 2479657 (CVE-2026-8836)

Summary: CVE-2026-8836 lwip: lwIP: Remote code execution via stack-based buffer overflow in SNMPv3 USM Handler
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: urgent Docs Contact:
Priority: urgent    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in lwIP. A remote attacker can exploit a stack-based buffer overflow vulnerability in the `snmp_parse_inbound_frame` function within the SNMPv3 User-based Security Model (USM) Handler. By manipulating specific authentication parameters, an attacker could potentially achieve arbitrary code execution, leading to a complete compromise of the affected system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2479776, 2479777    
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Description OSIDB Bzimport 2026-05-18 19:02:17 UTC 
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.