{"id":"CVE-2026-121944","title":"sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV","summary":"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 con…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-835"],"vendor":"irontec","product":"sngrep","affected":["sngrep <= 1.9.0"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-04T18:50:54.265569Z"},"exploitAvailable":true,"published":"2026-11-04","updated":"2026-11-04","sourceUpdated":"2026-11-04T18:51:15.773Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121944","references":[{"url":"https://github.com/irontec/sngrep/issues/589"},{"url":"https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read"},{"url":"https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598"},{"url":"https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv","label":"VulnCheck Advisory: sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV"}],"tags":["cve.org","exploit-available"],"ingestedAt":"2026-11-05T21:36:00.504Z","epss":0.00237,"epssPercentile":0.14832,"slug":"CVE-2026-121944","body":"## Overview\n\nsngrep 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.\n\n## Affected\n\n- `sngrep <= 1.9.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}