CVE-2026-58058 EXPLOIT
6.5
MEDIUM · CVSS 3.1 · EPSS 1.5% (pctl 73)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 6.5 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| EPSS | 1.45% — more likely to be exploited than 73% of all CVEs |
| Weakness | CWE-191 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2026-06-28 |
| Last modified | 2026-06-30 |
Affected (1)
| Vendor | Product |
|---|---|
| nmap | nmap |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Nmap 7.99 - Extension Header Integer Underflow | 2026-08-17 |
References
→ the Explorer · watch your stack · NVD