CVE-2026-72712

medium

Description

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.

References

https://www.vulncheck.com/advisories/nmap-denial-of-service-via-zero-length-tcp-option-packet

https://github.com/nmap/nmap/issues/3368

https://github.com/nmap/nmap/commit/7ef4ee030a0023fe22616387a000032e1a678b6a

https://github.com/nmap/nmap

Details

Source: Mitre, NVD

Published: 2026-08-11

Updated: 2026-08-13

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 6.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Severity: Medium

CVSS v4

Base Score: 6.9

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00423