{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"irontec/sngrep","product":"sngrep","source":"CNA: VulnCheck","vendor":"irontec","versions":[{"lessThanOrEqual":"1.9.0","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-121944","cwes":["CWE-835"],"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.","epss":null,"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://hackmd.io/@haindpwn/cve-2026-121943-121944-sngrep-sip-payload-missing-nul-oob-read"}],"kev":null,"metrics":[{"score":6.8,"severity":"medium","source":"CNA: VulnCheck","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","version":"4.0"},{"score":5.5,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},{"score":6.8,"severity":"medium","source":"NVD: disclosure@vulncheck.com","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","version":"4.0"},{"score":5.5,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793818275773,"publishedAt":1793795481803,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/irontec/sngrep/issues/589"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://hackmd.io/@haindpwn/cve-2026-121943-121944-sngrep-sip-payload-missing-nul-oob-read"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/irontec/sngrep/issues/589"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv"}],"remediation":[],"revision":"8436c593e1d2664959cb6af1e421569fee93c346d97f1e15d487d84bf930f0e6","sources":[{"modifiedAt":1793818275773,"name":"CNA: VulnCheck","retrievedAt":1793819424081,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121944"},{"modifiedAt":1793798249253,"name":"NVD","retrievedAt":1793816700573,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121944"}],"ssvc":{"assessedAt":1793818254265,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV","updatedAt":1793819424081}