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

Quick assessment

Affected
Nmap 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组织开源的一个用于网络发现与安全扫描的工具。 nmap 7.99及之前版本存在数字错误漏洞，该漏洞源于在ipv6_get_data_primitive（libnetutil/netutil.cc）中未将IPv6扩展标头遍历限制在捕获的数据包内，导致指针超出缓冲区且剩余长度计算下溢为较大值，可能使扫描目标或路径上的攻击者通过返回带有截断扩展标头的特制IPv6响应，在原始IPv6扫描期间触发越界读取和崩溃。

CVSS 6.5 · Medium EPSS 1.45% · P73

Public Exploits 1

ExploitDB · 1 EDB-52647 [dos]

Possible ATT&CK Techniques 1 AI

T1204.002 · Malicious File

Affected Version Matrix 1

VendorProduct Version RangeStatus
Nmap Nmap ≤ 7.99 affected
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I. Basic Information for CVE-2026-58058

Vulnerability Information
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Vulnerability Title
Nmap - Integer Underflow in IPv6 Extension Header Parsing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
nmap 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nmap是NMAP组织开源的一个用于网络发现与安全扫描的工具。 nmap 7.99及之前版本存在数字错误漏洞，该漏洞源于在ipv6_get_data_primitive（libnetutil/netutil.cc）中未将IPv6扩展标头遍历限制在捕获的数据包内，导致指针超出缓冲区且剩余长度计算下溢为较大值，可能使扫描目标或路径上的攻击者通过返回带有截断扩展标头的特制IPv6响应，在原始IPv6扫描期间触发越界读取和崩溃。
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 Nmap 0 ~ 7.99 -

II. Public POCs for CVE-2026-58058

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III. Intelligence Information for CVE-2026-58058

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Patches & Fixes for CVE-2026-58058 (1)

Proof of Concept for CVE-2026-58058 (1)

Other References for CVE-2026-58058 (1)

Other References for CVE-2026-58058 (1)

IV. Related Vulnerabilities

Same product: Nmap
Same weakness: CWE-191

V. Comments for CVE-2026-58058

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