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Vulnerability · Published May 18, 2026 · Assigned by VulDB

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

Critical 9.8

In plain English

A critical-severity stack buffer overflow in lwIP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.1%top 34.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12lwipno fix listedDEBIAN-CVE-2026-8836
Debian:13lwip2.2.1+dfsg1-1+deb13u1DEBIAN-CVE-2026-8836
Debian:14lwip2.2.1+dfsg1-5DEBIAN-CVE-2026-8836
Ubuntu:25.10lwipno fix listedUBUNTU-CVE-2026-8836
Ubuntu:26.10lwipno fix listedUBUNTU-CVE-2026-8836

Affected products (as reported)

VendorProductVersions
n/a lwIP 2.1.02.1.12.1.22.1.32.2.02.2.1

Weakness: CWE-121, CWE-119 · Vector: 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

References