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Vulnerability record · CVE-2026-58058 · published 28 June 2026

CVE-2026-58058: Nmap vulnerability

Nmap · Nmap

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.

6.9 CVSS 4.0 Medium EPSS 1.5% · top 27.6% CWE-191 · CWE-191
6.9CVSS 4.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
30 Jun 2026Last modified by NVD

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.

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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc Broken Link
https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83 Patch
https://nmap.org/changelog.html PatchRelease Notes
https://www.vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing PatchThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-58058), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.