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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Nmap Nmap affected
Version Status Constraints
0 affected ≤ 7.99

No data.

No data.

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Project Subscriptions

Vendors Products
Nmap Subscribe
Nmap Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc cve-icon
https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83 cve-icon
https://nmap.org/changelog.html cve-icon
https://www.vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing cve-icon
History

Sun, 28 Jun 2026 02:15:00 +0000

Type Values Removed Values Added
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.
Title Nmap - Integer Underflow in IPv6 Extension Header Parsing
First Time appeared Nmap
Nmap nmap
Weaknesses CWE-191
CPEs cpe:2.3:a:nmap:nmap:*:*:*:*:*:*:*:*
Vendors & Products Nmap
Nmap nmap
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'}

cvssV4_0

{'score': 6.9, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-06-28T01:32:59.336Z

Reserved: 2026-06-28T00:58:47.763Z

Link: CVE-2026-58058

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-28T03:30:05Z

Weaknesses