{"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-2026-121943","cwes":["CWE-170"],"description":"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 SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},{"score":4.8,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L","version":"3.1"}],"modifiedAt":1793795481162,"publishedAt":1793795481162,"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/sip.c#L396-L410"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/irontec-sngrep-through-1.9.0-out-of-bounds-stack-read-via-sip-check-packet"}],"remediation":[],"revision":"27f88631bee5f0721cc6661fd48b48eb34a3928e59a667d60fb7dd55dc61debc","sources":[{"modifiedAt":1793795481162,"name":"CNA: VulnCheck","retrievedAt":1793797816422,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121943"}],"ssvc":null,"status":"published","title":"Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet","updatedAt":1793797816422}