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CVE-2026-72712— Nmap 7.99 Denial of Service via Zero-Length TCP Option Packet

Quick assessment

Affected
Nmap Project Nmap
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nmap是nmap组织的一款网络发现与安全扫描工具。 Nmap 7.99及之前版本存在资源管理错误漏洞，该漏洞源于nselib/packet.lua中的Packet:parse_options()函数在处理包含零长度TCP选项的特制数据包时无限循环分配对象，导致内存耗尽，可能造成远程攻击者使应用程序崩溃，导致拒绝服务。

CVSS 6.5 · Medium EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Nmap Project Nmap ≤ 7.99 affected
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I. Basic Information for CVE-2026-72712

Vulnerability Information
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Vulnerability Title
Nmap 7.99 Denial of Service via Zero-Length TCP Option Packet
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Nmap 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nmap是nmap组织的一款网络发现与安全扫描工具。 Nmap 7.99及之前版本存在资源管理错误漏洞，该漏洞源于nselib/packet.lua中的Packet:parse_options()函数在处理包含零长度TCP选项的特制数据包时无限循环分配对象，导致内存耗尽，可能造成远程攻击者使应用程序崩溃，导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Nmap Project Nmap 0 ~ 7.99 -

II. Public POCs for CVE-2026-72712

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III. Intelligence Information for CVE-2026-72712

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Patches & Fixes for CVE-2026-72712 (2)

Vendor Advisories for CVE-2026-72712 (1)

Proof of Concept for CVE-2026-72712 (1)

IV. Related Vulnerabilities

Same product: Nmap
Same weakness: CWE-835

V. Comments for CVE-2026-72712

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