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A medium-severity vulnerability (CVE-2026-58058) has been identified in Nmap, an open-source network scanning tool, that allows for a denial of service condition. The vulnerability is associated with Fedora Linux distributions and relates to a weakness classified under CWE-191 (Integer Underflow). No CVSS score or patch information is currently available, and no known exploits are reported in the wild.

CVE-2026-58058 is a denial of service vulnerability in Nmap, a widely used open-source network mapper and security scanner. The issue is linked to an integer underflow weakness (CWE-191) that can be triggered to cause service disruption. The vulnerability affects Fedora Linux distributions running Nmap, specifically version 7.99 as indicated by tags. There is no CVSS score assigned yet, no public patch or remediation details, and no known active exploitation. The advisory is published by the Bundesamt für Sicherheit in der Informationstechnik and referenced by the Microsoft Security Response Center.

Exploit code for Nmap  7.99  - Extension Header Integer Underflow

Detailed information about Nmap - Integer Underflow in IPv6 Extension Header Parsing affecting Microsoft Security Response Center Microsoft. Get real-time updat

Nmap - Integer Underflow in IPv6 Extension Header Parsing - Live Threat Intelligence - Threat Radar | OffSeq.com

WID-SEC-W-2026-2098 - CSAF Version

WID-SEC-2026-2098 - Portal Version

GitHub Security Advisory GHSA-wxvj-hc4r-fq45 vom 2026-06-28

Fedora Security Advisory FEDORA-2026-3B30FA1DA4 vom 2026-07-01

Fedora Security Advisory FEDORA-2026-0245FD9F84 vom 2026-07-01

Fedora Security Advisory FEDORA-2026-602D919DBC vom 2026-07-01

nmap: Schwachstelle ermöglicht Denial of Service

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