{"id":"CVE-2026-121943","title":"Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet","summary":"Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP S…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L","cvssSource":"cna","cwe":["CWE-170"],"vendor":"irontec","product":"sngrep","affected":["sngrep <= 1.9.0"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-04T18:51:33.759102Z"},"exploitAvailable":true,"published":"2026-11-04","updated":"2026-11-04","sourceUpdated":"2026-11-04T18:51:59.965Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121943","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/sip.c#L396-L410"},{"url":"https://www.vulncheck.com/advisories/irontec-sngrep-through-1.9.0-out-of-bounds-stack-read-via-sip-check-packet","label":"VulnCheck Advisory: Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet"}],"tags":["cve.org","exploit-available"],"ingestedAt":"2026-11-05T21:36:00.506Z","epss":0.05551,"epssPercentile":0.92893,"slug":"CVE-2026-121943","body":"## Overview\n\nIrontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.\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":40,"depthScoreParts":{"impact":26.4,"likelihood":1.1,"exploitation":12,"ransomware":0},"changes":[{"seq":235470,"id":"CVE-2026-121943","ts":1793984635338,"field":"epss","old":null,"new":"0.05551"}]}