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.

CVSS v4.0

6.9 MEDIUMCVSS: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:X/V:X/RE:X/U:X

CVSS v3.1

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

EPSS

1.37% chance of exploitation in the next 30 days, 70th percentile

Published

2026-06-28

Updated

2026-06-29

Proof-of-concept exploits (1)

• bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/52647

References

• CVE Record
• NVD entry

Related

• CVE-2026-58049
• CVE-2026-58050
• CVE-2026-58051
• CVE-2026-58052
• CVE-2026-58053
• CVE-2026-58055