{"id":"UBUNTU-CVE-2026-125406","details":"Ettercap through 0.8.4.1 contains a stack buffer underwrite vulnerability in the telnet dissector in src/dissectors/ec_telnet.c that decrements the output pointer on backspace without a lower bound check. Attackers can send a telnet stream with more backspaces than preceding characters to write below the stack buffer, corrupting the stack of the Ettercap process that normally runs as root.","modified":"2026-11-11T09:39:23.126079144Z","published":"2026-11-10T00:00:00Z","upstream":["CVE-2026-125406"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-125406"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-125406"},{"type":"REPORT","url":"github.com/ettercap/ettercap"}],"affected":[{"package":{"name":"ettercap","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ettercap?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.8.2-2","1:0.8.2-2build1","1:0.8.2-2ubuntu1.16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"ettercap-common","binary_version":"1:0.8.2-2ubuntu1.16.04.1"},{"binary_name":"ettercap-graphical","binary_version":"1:0.8.2-2ubuntu1.16.04.1"},{"binary_name":"ettercap-text-only","binary_version":"1:0.8.2-2ubuntu1.16.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125406.json"}},{"package":{"name":"ettercap","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/ettercap?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.8.2-10build1","1:0.8.2-10build2","1:0.8.2-10build3","1:0.8.2-10build4"],"ecosystem_specific":{"binaries":[{"binary_name":"ettercap-common","binary_version":"1:0.8.2-10build4"},{"binary_name":"ettercap-graphical","binary_version":"1:0.8.2-10build4"},{"binary_name":"ettercap-text-only","binary_version":"1:0.8.2-10build4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125406.json"}},{"package":{"name":"ettercap","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/ettercap?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.8.2-10build6","1:0.8.3-1ubuntu1","1:0.8.3-2~build1","1:0.8.3-2","1:0.8.3-3","1:0.8.3-5","1:0.8.3-6","1:0.8.3-7"],"ecosystem_specific":{"binaries":[{"binary_name":"ettercap-common","binary_version":"1:0.8.3-7"},{"binary_version":"1:0.8.3-7","binary_name":"ettercap-graphical"},{"binary_name":"ettercap-text-only","binary_version":"1:0.8.3-7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125406.json"}},{"package":{"name":"ettercap","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/ettercap?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.8.3.1-3","1:0.8.3.1-4","1:0.8.3.1-4build1","1:0.8.3.1-5"],"ecosystem_specific":{"binaries":[{"binary_version":"1:0.8.3.1-5","binary_name":"ettercap-common"},{"binary_version":"1:0.8.3.1-5","binary_name":"ettercap-graphical"},{"binary_name":"ettercap-text-only","binary_version":"1:0.8.3.1-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125406.json"}},{"package":{"name":"ettercap","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/ettercap?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.8.3.1-12","1:0.8.3.1-13","1:0.8.3.1-13build2","1:0.8.3.1-13build3"],"ecosystem_specific":{"binaries":[{"binary_version":"1:0.8.3.1-13build3","binary_name":"ettercap-common"},{"binary_name":"ettercap-graphical","binary_version":"1:0.8.3.1-13build3"},{"binary_version":"1:0.8.3.1-13build3","binary_name":"ettercap-text-only"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125406.json"}},{"package":{"name":"ettercap","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/ettercap?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.8.4.1-2","1:0.8.4.1-2build1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:0.8.4.1-2build1","binary_name":"ettercap-common"},{"binary_version":"1:0.8.4.1-2build1","binary_name":"ettercap-graphical"},{"binary_name":"ettercap-text-only","binary_version":"1:0.8.4.1-2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125406.json"}},{"package":{"name":"ettercap","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/ettercap?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:0.8.3.1-15","1:0.8.3.1-15build1","1:0.8.3.1-16","1:0.8.4-2","1:0.8.4-4","1:0.8.4-5","1:0.8.4.1-1","1:0.8.4.1-2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:0.8.4.1-2","binary_name":"ettercap-common"},{"binary_name":"ettercap-graphical","binary_version":"1:0.8.4.1-2"},{"binary_name":"ettercap-text-only","binary_version":"1:0.8.4.1-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125406.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}