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CVE-2026-58058

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cc24d92f4a3c00f7a717e27250f29ef569185e881837e70a4cafa7cac88a4d14
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/metrics/0/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"Nmap","vendor":"Nmap","versions":[{"lessThanOrEqual":"7.99","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-191","description":"Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Proof of Concept","tags":["exploit","third-party-advisory"],"url":"https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/references/0
{"name":"Fix commit (dev tree)","tags":["patch"],"url":"https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/references/1
{"name":"Nmap Change Log","tags":["release-notes"],"url":"https://nmap.org/changelog.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/references/2
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7be6f3c593efe88340d68713e32e4046f4351600659fe5eb236d21d056c1b32 · sha256:4cad1b2aa9fa69a1… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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