{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-58058", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-06-28T00:58:47.763Z", "datePublished": "2026-06-28T01:32:59.336Z", "dateUpdated": "2026-06-28T01:32:59.336Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-06-28T01:32:59.336Z"}, "datePublic": "2026-06-25T00:00:00.000Z", "title": "Nmap - Integer Underflow in IPv6 Extension Header Parsing", "descriptions": [{"lang": "en", "value": "Nmap through 7.99 does not keep the IPv6 extension-header walk within the captured packet in ipv6_get_data_primitive (libnetutil/netutil.cc), so the pointer advances past the buffer and the remaining-length computation underflows to a large value. A scanned target or on-path attacker returning a crafted IPv6 response with a truncated extension header can trigger out-of-bounds reads and a crash during raw IPv6 scans."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Integer Underflow (Wrap or Wraparound)", "cweId": "CWE-191", "type": "CWE"}]}], "affected": [{"vendor": "Nmap", "product": "Nmap", "defaultStatus": "affected", "versions": [{"version": "0", "status": "affected", "versionType": "custom", "lessThanOrEqual": "7.99"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nmap:nmap:*:*:*:*:*:*:*:*", "versionEndIncluding": "7.99"}]}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc", "name": "Proof of Concept", "tags": ["exploit", "third-party-advisory"]}, {"url": "https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83", "name": "Fix commit (dev tree)", "tags": ["patch"]}, {"url": "https://nmap.org/changelog.html", "name": "Nmap Change Log", "tags": ["release-notes"]}, {"name": "VulnCheck Advisory: Nmap - Integer Underflow in IPv6 Extension Header Parsing", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing"}], "credits": [{"lang": "en", "value": "Himanshu Anand", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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