{"id":"UBUNTU-CVE-2026-8836","details":"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.","modified":"2026-09-02T19:36:35.109804561Z","published":"2026-05-18T19:16:00Z","related":["USN-8423-1"],"upstream":["CVE-2026-8836"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-8836"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-8836"},{"type":"REPORT","url":"https://savannah.nongnu.org/bugs/?68194"},{"type":"REPORT","url":"https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c"},{"type":"REPORT","url":"https://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c"},{"type":"REPORT","url":"https://vuldb.com/submit/829798"},{"type":"REPORT","url":"https://vuldb.com/vuln/364474"},{"type":"REPORT","url":"https://vuldb.com/vuln/364474/cti"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8423-1"}],"affected":[{"package":{"name":"lwip","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.2+dfsg1-4ubuntu0.1~esm1"}]}],"versions":["2.1.2-3","2.1.2-5.1","2.1.2+dfsg1-1","2.1.2+dfsg1-4"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"2.1.2+dfsg1-4ubuntu0.1~esm1","binary_name":"liblwip0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"}},{"package":{"name":"lwip","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.3+dfsg1-1ubuntu0.1~esm1"}]}],"versions":["2.1.2+dfsg1-8","2.1.2+dfsg1-9","2.1.3+dfsg1-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"2.1.3+dfsg1-1ubuntu0.1~esm1","binary_name":"liblwip0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"}},{"package":{"name":"lwip","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.0+dfsg1-6.1ubuntu0.1~esm1"}]}],"versions":["2.1.3+dfsg1-2","2.1.3+dfsg1-4","2.2.0+dfsg1-2","2.2.0+dfsg1-3","2.2.0+dfsg1-4","2.2.0+dfsg1-5","2.2.0+dfsg1-6","2.2.0+dfsg1-6.1","2.2.0+dfsg1-6.1build1","2.2.0+dfsg1-6.1build2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.0+dfsg1-6.1ubuntu0.1~esm1","binary_name":"liblwip0t64"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"}},{"package":{"name":"lwip","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.1+dfsg1-1","2.2.1+dfsg1-2"],"ecosystem_specific":{"binaries":[{"binary_name":"liblwip0t64","binary_version":"2.2.1+dfsg1-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"}},{"package":{"name":"lwip","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.1+dfsg1-4ubuntu0.1~esm1"}]}],"versions":["2.2.1+dfsg1-2","2.2.1+dfsg1-3","2.2.1+dfsg1-4"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"liblwip0t64","binary_version":"2.2.1+dfsg1-4ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"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/E:P"},{"type":"Ubuntu","score":"medium"}]}