CVE-2026-8836

Publication date 18 May 2026

Last updated 19 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

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.

Status

Package Ubuntu Release Status
lwip 26.04 LTS resolute
Fixed 2.2.1+dfsg1-4ubuntu0.1~esm1
25.10 questing
Vulnerable
24.04 LTS noble
Fixed 2.2.0+dfsg1-6.1ubuntu0.1~esm1
22.04 LTS jammy
Fixed 2.1.3+dfsg1-1ubuntu0.1~esm1
20.04 LTS focal
Fixed 2.1.2+dfsg1-4ubuntu0.1~esm1

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
lwip

Severity score breakdown

CVSS version:

Base score 9.3 · Critical

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities