CVE-2026-58058 – Nmap – Integer Underflow in IPv6 Extension Header Parsing

CVE ID :CVE-2026-58058

Published : June 28, 2026, 1:32 a.m. | 2 hours, 12 minutes ago

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.

Severity: 6.9 | MEDIUM

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