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 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.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.016 (74.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.016 · change: +0.005
Affected products
- Lwip — versions 2.1.0, 2.1.1, 2.1.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- vuldb.com/vuln/364474 (technical-description, vdb-entry)
- vuldb.com/vuln/364474/cti (signature, permissions-required)
- vuldb.com/submit/829798 (third-party-advisory)
- savannah.nongnu.org/bugs/ (broken-link)
- cgit.git.savannah.gnu.org/cgit/lwip.git/commit/ (patch, broken-link)
- github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c (patch)
- vuldb.com/cve/CVE-2026-8836 (third-party-advisory)
- savannah.nongnu.org/bugs/ (broken-link)
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.