{"id":"CVE-2026-121944","aliases":["DEBIAN-CVE-2026-121944","EUVD-2026-116901","GHSA-5wr4-785p-23qx","UBUNTU-CVE-2026-121944"],"status":"published","title":"sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV","description":"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.","severity":{"version":"4.0","score":6.8,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00237,"percentile":0.14897,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-835"],"published":"2026-11-04T00:00:00Z","modified":"2026-11-06T07:00:06Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.0-1","1.7.0-1","1.7.0-2","1.7.0-2~bpo12+1","1.8.0-1","1.8.1-1","1.8.2-1","1.8.2-1~bpo12+1","1.8.3-1","1.8.3-1~bpo13+1","1.8.4-1","1.8.4-1~bpo13+1","1.8.4-2","1.9.0-1"]},{"source":"osv","ecosystem":"Debian:13","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.2-1","1.8.3-1","1.8.3-1~bpo13+1","1.8.4-1","1.8.4-1~bpo13+1","1.8.4-2","1.9.0-1"]},{"source":"osv","ecosystem":"Debian:14","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.2-1","1.8.3-1","1.8.3-1~bpo13+1","1.8.4-1","1.8.4-1~bpo13+1","1.8.4-2","1.9.0-1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"sngrep","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"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.3-1","1.4.4-1","1.4.4-2","1.4.5-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.6-1","1.4.6-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.9-1","1.4.10-1","1.4.10-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.0-2","1.8.0-1","1.8.0-1build1","1.8.0-1build2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-1","1.8.4-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"sngrep","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.2-1","1.8.3-1"]}],"products":[{"vendor":"irontec","product":"sngrep"}],"references":[{"url":"https://github.com/irontec/sngrep/issues/589","tags":["issue-tracking","report"]},{"url":"https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598","tags":["technical-description","article"]},{"url":"https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv","tags":["third-party-advisory","advisory"]},{"url":"https://hackmd.io/@haindpwn/cve-2026-121943-121944-sngrep-sip-payload-missing-nul-oob-read","tags":["exploit","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121944","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5wr4-785p-23qx"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121944.json","tags":["advisory"]},{"url":"https://github.com/irontec/sngrep","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-121944","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-121944","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-121944","tags":["report"]},{"url":"github.com/irontec/sngrep","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-121944","title":"sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV","description":"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.","status":"published","published":"2026-11-04T12:31:21.803Z","modified":"2026-11-04T18:51:15.773Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium","assessor":"cna"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-835"],"updated_at":"2026-11-04T19:37:11.952963Z"}],"euvd":[{"id":"EUVD-2026-116901","description":"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.","status":"published","published":"2026-11-04T12:31:21Z","modified":"2026-11-04T18:51:15Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium"}],"updated_at":"2026-11-04T20:13:45.839046Z"}],"ghsa":[{"id":"GHSA-5wr4-785p-23qx","title":"sngrep through 1.9.0 contains an infinite loop vulnerability in capture_packet_reasm_ip() in src...","description":"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.","status":"published","published":"2026-11-04T15:32:30Z","modified":"2026-11-04T21:32:27Z","cvss":[{"version":"4.0","score":6.8,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-835"],"updated_at":"2026-11-04T21:42:45.289646Z"}],"nvd":[{"id":"CVE-2026-121944","description":"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.","status":"published","published":"2026-11-04T13:17:29.123Z","modified":"2026-11-04T19:17:34.8Z","cvss":[{"version":"4.0","score":6.8,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-835"],"updated_at":"2026-11-04T21:42:34.71458Z"}],"osv":[{"id":"CVE-2026-121944","title":"sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV","description":"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.","status":"published","published":"2026-11-04T12:31:21.803Z","modified":"2026-11-05T21:32:21.755939065Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium"}],"cwes":["CWE-835"],"updated_at":"2026-11-05T22:00:34.245765Z"},{"id":"DEBIAN-CVE-2026-121944","description":"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.","status":"published","published":"2026-11-04T13:17:29.123Z","modified":"2026-11-07T01:00:06.002491085Z","cvss":[{"version":"4.0","score":6.8,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-07T01:26:17.791146Z"},{"id":"UBUNTU-CVE-2026-121944","description":"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.","status":"published","published":"2026-11-04T00:00:00Z","modified":"2026-11-06T01:00:35.255041955Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"},{"version":"4.0","score":6.8,"vector":"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","level":"medium"}],"updated_at":"2026-11-06T01:33:05.666804Z"}]}}