PT-2026-53090 · Undefined · Undefined

Published 2026-06-28 · Updated 2026-06-28 · CVE-2026-58058

NVD

CVSS v3.1

6.5

Medium

Base vector

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

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.

Exploit

Fix

Integer Underflow

Weakness Enumeration

CWE-191

Related Identifiers

CVE-2026-58058

Affected Products

Undefined

References · 5

• 🔥 https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-58058 · Security Note
• https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83 · Note
• https://vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing · Note
• https://nmap.org/changelog.html · Note