Buffer overflow in Lwip
CVE-2026-8836
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 msgAuthenticationParameter…
Vulnerability class: Buffer Overflow
EPSS: 0.003 (52.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- N/a Lwip — versions 2.1.0, 2.1.1, 2.1.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cna@vuldb.com (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (broken-link)
- cna@vuldb.com (patch, broken-link)
- cna@vuldb.com (patch)
Frequently asked questions
- What is CVE-2026-8836?
- CVE-2026-8836 is a critical-severity vulnerability in Lwip, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-05-18.
- How severe is CVE-2026-8836?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-8836 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.