{"id":"CVE-2026-58058","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-58058","generatedAt":"2026-10-28T08:11:24.209Z","title":"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.","description":"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.","published":"2026-06-28T02:16:33.000Z","lastModified":"2026-10-25T17:10:00.000Z","status":"Analyzed","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":6.9,"severity":"MEDIUM","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-191"],"affected":["nmap/nmap"],"epss":{"score":0.01454,"percentile":0.73316,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2026-08-17","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":52647,"kind":"exploit","title":"Nmap  7.99  - Extension Header Integer Underflow","url":"https://www.exploit-db.com/exploits/52647","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/dos/52647.py","file":"exploits/multiple/dos/52647.py","published":"2026-08-17","added":"2026-08-17","updated":"2026-08-17","author":"banyamer","type":"dos","platform":"multiple","port":null,"verified":false,"codes":["CVE-2026-58058"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"high","text":"A public exploit is published in Exploit-DB, so the technical barrier is gone even though the severity is medium and EPSS is 1.5%. Treat it as high on anything reachable from the internet."},"changes":[],"references":[{"url":"https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc","tags":["Broken Link"],"source":"disclosure@vulncheck.com"},{"url":"https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83","tags":["Patch"],"source":"disclosure@vulncheck.com"},{"url":"https://nmap.org/changelog.html","tags":["Patch","Release Notes"],"source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing","tags":["Patch","Third Party Advisory"],"source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-58058","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}