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    <lastBuildDate>Wed, 30 Sep 2026 11:12:12 +0000</lastBuildDate>
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      <title>CVE-2026-58058 — Nmap - Integer Underflow in IPv6 Extension Header Parsing</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-58058</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Nmap&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Nmap&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://vulnerability.circl.lu/vuln/cve-2026-58058</guid>
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