{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-121944", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-04T12:05:51.303Z", "datePublished": "2026-11-04T12:31:21.803Z", "dateUpdated": "2026-11-04T12:31:21.803Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-04T12:31:21.803Z"}, "datePublic": "2026-10-21T13:36:25.000Z", "title": "sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Loop with Unreachable Exit Condition ('Infinite Loop')", "cweId": "CWE-835", "type": "CWE"}]}], "affected": [{"vendor": "irontec", "product": "sngrep", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThanOrEqual": "1.9.0", "status": "affected", "versionType": "semver"}], "packageURL": "pkg:github/irontec/sngrep", "repo": "https://github.com/irontec/sngrep"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:irontec:sngrep:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.9.0"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "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", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/irontec/sngrep/issues/589", "tags": ["issue-tracking"]}, {"url": "https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read", "tags": ["third-party-advisory"]}, {"url": "https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv"}], "credits": [{"lang": "en", "value": "HaiND from the Post and Telecommunication Institute of Technology", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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