{"id":"UBUNTU-CVE-2026-18839","details":"An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.","modified":"2026-08-13T03:01:07.288248Z","published":"2026-08-05T21:16:00Z","upstream":["CVE-2026-18839"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-18839"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-18839"}],"affected":[{"package":{"name":"popt","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/popt?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16-7ubuntu3","1.16-8","1.16-8ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libpopt0","binary_version":"1.16-8ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18839.json"}},{"package":{"name":"popt","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/popt?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16-10"],"ecosystem_specific":{"binaries":[{"binary_version":"1.16-10","binary_name":"libpopt0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18839.json"}},{"package":{"name":"popt","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/popt?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16-10","1.16-11"],"ecosystem_specific":{"binaries":[{"binary_name":"libpopt0","binary_version":"1.16-11"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18839.json"}},{"package":{"name":"popt","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/popt?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16-12","1.16-14"],"ecosystem_specific":{"binaries":[{"binary_name":"libpopt0","binary_version":"1.16-14"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18839.json"}},{"package":{"name":"popt","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/popt?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18-2build2","1.18-2build3","1.18-3","1.18-3build1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.18-3build1","binary_name":"libpopt0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18839.json"}},{"package":{"name":"popt","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/popt?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.19+dfsg-1","1.19+dfsg-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.19+dfsg-1build1","binary_name":"libpopt0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18839.json"}},{"package":{"name":"popt","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/popt?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.19+dfsg-2","1.19+dfsg-2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libpopt0","binary_version":"1.19+dfsg-2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18839.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}