{"id":"UBUNTU-CVE-2026-95508","details":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","modified":"2026-09-24T02:03:14.123541995Z","published":"2026-09-22T09:17:00Z","upstream":["CVE-2026-95508"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-95508"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-95508"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2537748"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-95508"}],"affected":[{"package":{"name":"libslirp","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libslirp?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.0-1","4.0.0-2","4.1.0-1","4.1.0-2","4.1.0-2ubuntu1","4.1.0-2ubuntu2","4.1.0-2ubuntu2.1","4.1.0-2ubuntu2.2"],"ecosystem_specific":{"binaries":[{"binary_name":"libslirp0","binary_version":"4.1.0-2ubuntu2.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-95508.json"}},{"package":{"name":"libslirp","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libslirp?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.0-1build1","4.6.1-1","4.6.1-1build1","4.6.1-1ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_name":"libslirp0","binary_version":"4.6.1-1ubuntu0.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-95508.json"}},{"package":{"name":"libslirp","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libslirp?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.0-1ubuntu1","4.7.0-1ubuntu2","4.7.0-1ubuntu3","4.7.0-1ubuntu3.1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.7.0-1ubuntu3.1","binary_name":"libslirp0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-95508.json"}},{"package":{"name":"libslirp","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libslirp?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-1ubuntu1","4.9.1-1ubuntu1","4.9.1-1ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.9.1-1ubuntu1.1","binary_name":"libslirp0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-95508.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}