PT-2026-41721 · Lwip+2 · Lwip+2

0Rbitingzer0 · CVE-2026-8836 · Published 2026-05-18 · Updated 2026-06-12

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

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.

Exploit

Fix

Buffer Overflow

Stack Overflow

Weakness Enumeration

CWE-119

CWE-121

Related Identifiers

CVE-2026-8836

OESA-2026-2480

USN-8423-1

Affected Products

Linuxmint

Ubuntu

Lwip

References · 26

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8836.json · Exploit
• https://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c · Patch
• https://ubuntu.com/security/CVE-2026-8836 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-8836 · Security Note
• https://osv.dev/vulnerability/CVE-2026-8836 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-22284 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8836 · Vendor Advisory
• https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c · Patch
• https://osv.dev/vulnerability/USN-8423-1 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2480 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-8836 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8836 · Security Note
• https://ubuntu.com/security/CVE-2020-22283 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8423-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-8836 · Vendor Advisory