{"id":"UBUNTU-CVE-2026-120830","details":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","modified":"2026-11-04T03:30:46.048940943Z","published":"2026-11-03T00:00:00Z","upstream":["CVE-2026-120830"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-120830"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-120830"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-120830"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2565424"},{"type":"REPORT","url":"https://gitlab.freedesktop.org/slirp/libslirp/-/commit/21b33a6c5588af9f58d15e528fdc1019452708e4"}],"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-2026-120830.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_version":"4.6.1-1ubuntu0.2","binary_name":"libslirp0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.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-2026-120830.json"}},{"package":{"name":"libslirp","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/libslirp?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9.1-1ubuntu1","4.9.3-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.9.3-1ubuntu1","binary_name":"libslirp0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.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_name":"libslirp0","binary_version":"4.9.1-1ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}