{"id":"UBUNTU-CVE-2026-121944","details":"sngrep through 1.9.0 contains an infinite loop vulnerability in capture_packet_reasm_ip() in src/capture.c that allows attackers to cause denial of service via crafted NFLOG TLVs. Attackers can supply a pcap file with link type NFLOG containing a non-payload TLV with length under 4, making the capture thread spin at full CPU and stop processing packets.","modified":"2026-11-05T11:46:32.140036701Z","published":"2026-11-04T00:00:00Z","upstream":["CVE-2026-121944"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-121944"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-121944"},{"type":"REPORT","url":"github.com/irontec/sngrep"}],"affected":[{"package":{"name":"sngrep","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/sngrep?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.1-1","1.0.0-1","1.1.0-1","1.2.0-1","1.2.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.2.0-1build1","binary_name":"sngrep"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121944.json"}},{"package":{"name":"sngrep","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/sngrep?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.3-1","1.4.4-1","1.4.4-2","1.4.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"sngrep","binary_version":"1.4.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121944.json"}},{"package":{"name":"sngrep","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/sngrep?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.6-1","1.4.6-2"],"ecosystem_specific":{"binaries":[{"binary_name":"sngrep","binary_version":"1.4.6-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121944.json"}},{"package":{"name":"sngrep","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/sngrep?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.9-1","1.4.10-1","1.4.10-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"sngrep","binary_version":"1.4.10-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121944.json"}},{"package":{"name":"sngrep","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/sngrep?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.0-2","1.8.0-1","1.8.0-1build1","1.8.0-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"sngrep","binary_version":"1.8.0-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121944.json"}},{"package":{"name":"sngrep","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/sngrep?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-1","1.8.4-1"],"ecosystem_specific":{"binaries":[{"binary_name":"sngrep","binary_version":"1.8.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121944.json"}},{"package":{"name":"sngrep","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/sngrep?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.2-1","1.8.3-1"],"ecosystem_specific":{"binaries":[{"binary_name":"sngrep","binary_version":"1.8.3-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121944.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}