PT-2026-41721 · Lwip · Lwip

0Rbitingzer0 · Published 2026-05-18 · Updated 2026-05-20 · CVE-2026-8836

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions lwIP versions prior to 2.2.2

Description A stack-based buffer overflow exists in the snmpv3 USM Handler component. A remote attacker can trigger this issue by manipulating the msgAuthenticationParameters argument within the snmp parse inbound frame() function located in the src/apps/snmp/snmp msg.c file.

Recommendations Install patch 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. As a temporary workaround, restrict access to the snmpv3 USM Handler component to minimize the risk of exploitation.

Fix

Buffer Overflow

Stack Overflow

Weakness Enumeration

CWE-119

CWE-121

Related Identifiers

CVE-2026-8836

Affected Products

Lwip

References · 16

• https://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-8836 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8836 · Security Note
• https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8836 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-8836 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-8836 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-8836 · Vendor Advisory
• https://t.me/CVEtracker/54157 · Telegram Post
• https://vuldb.com/submit/829798 · Note
• https://twitter.com/vuldb/status/2056382121988808738 · Twitter Post
• https://vuldb.com/vuln/364474/cti · Note
• https://savannah.nongnu.org/bugs/?68194 · Note
• https://vuldb.com/vuln/364474 · Note
• https://twitter.com/CVEnew/status/2056994238622314885 · Twitter Post