CVE-2026-72712

EUVD-2026-56821
Nmap versions up to and including 7.99 contains a denial of service vulnerability that allows remote attackers to crash the application by sending a crafted packet containing a zero-length TCP option. The malformed packet forces the Packet:parse_options() function in nselib/packet.lua to allocate objects in an infinite loop, causing an out-of-memory condition that results in application crash.
Infinite Loop
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 40.23%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
nmapnmap
𝑥
≤ 7.99
CNA
Debian logo
Debian Releases
Debian Product
Codename
nmap
bookworm
unimportant
forky
unimportant
sid
unimportant
trixie
unimportant
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
nmap
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
trusty
needs-triage
xenial
needs-triage
Azure Linux logo
Azure Linux Releases
Azure Package
Release
nmap
Azure Linux 3.0
0:7.95-5.azl3
fixed
Common Weakness Enumeration
References
https://github.com/nmap/nmap
https://github.com/nmap/nmap/commit/7ef4ee030a0023fe22616387a000032e1a678b6a
https://github.com/nmap/nmap/issues/3368
https://www.vulncheck.com/advisories/nmap-denial-of-service-via-zero-length-tcp-option-packet
https://github.com/nmap/nmap/issues/3368