lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow (CVE-2026-8836) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-8836

lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow

Answer in brief

CVE-2026-8836 records a Unknown severity vulnerability in lwIP snmpv3 USM snmp_msg.c snmp_parse_inbound_frame stack-based overflow. The current sources do not mark it as known exploited. The current feed maps n/a/lwIP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 18, 2026Updated Aug 22, 2026Source checked Aug 22, 2026First seen by HOL Aug 22, 2026Material review Aug 22, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n/a/lwIP (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
n/a/lwIPgeneric	2.1.0 \|\| 2.1.1 \|\| 2.1.2 \|\| 2.1.3 \|\| 2.2.0 \|\| 2.2.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for n/a/lwIP.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
May 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 22, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.