CVE-2026-58058
Nmap - Integer Underflow in IPv6 Extension Header Parsing
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.
INFO
Published Date :
June 28, 2026, 2:16 a.m.
Last Modified :
June 30, 2026, 5:31 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Nmap to version 8.00 or later.
- Apply relevant security patches promptly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-58058.
| URL | Resource |
|---|---|
| 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 | Patch Release Notes |
| https://www.vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing | Patch Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-58058 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-58058
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-58058 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-58058 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 30, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:nmap:nmap:*:*:*:*:*:*:*:* versions up to (including) 7.99 Added Reference Type VulnCheck: https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc Types: Broken Link Added Reference Type VulnCheck: https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83 Types: Patch Added Reference Type VulnCheck: https://nmap.org/changelog.html Types: Patch, Release Notes Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing Types: Patch, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 29, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-58058', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-29T14:49:07.833303Z'} -
New CVE Received by [email protected]
Jun. 28, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Nmap', 'product': 'Nmap', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '7.99'}], 'defaultStatus': 'affected'}] 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. Added CVSS V4.0 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:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L Added CWE CWE-191 Added Reference https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc Added Reference https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83 Added Reference https://nmap.org/changelog.html Added Reference https://www.vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing