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TI-2026-41812 Aliases CVE-2026-58058GHSA-wxvj-hc4r-fq45

Nmap - Integer Underflow in IPv6 Extension Header Parsing

Priority HIGH 70CWE-191Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · None · Low
Fix status
Deferred Red Hat: fix deferred

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01454 73rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Deferred Red Hat: fix deferred

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NmapNmapup to 7.99—No fix listedCNA
  • Nmap VendorNmap Affected up to 7.99 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nmap:nmap:*:*:*:*:*:*:*:*up to 7.99VulnerableNmap
  • cpe:2.3:a:nmap:nmap:*:*:*:*:*:*:*:* Versions up to 7.99 Vulnerable ·Nmap

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58058
  2. 2026-10-03 Alias added: GHSA-wxvj-hc4r-fq45
  3. 2026-11-06 Affected versions changed · Red Hat

References

Exploit 1

Patch 2

  • TI-2018-10857 Nmap through 7.70, when the -sV option is used, allows remote attackers to cause a denial… CVSS 3.0HIGH 7.5
  • TI-2013-04289 The http-domino-enum-passwords.nse script in NMap before 6.40, when… CVSS 2.0MEDIUM 6.8
  • TI-2017-13767 nse_libssh2.cc in Nmap 7.70 is subject to a denial of service condition due to a double… CVSS 3.0HIGH 7.5
  • TI-2026-00008 Protection mechanism failure in Google Android CVSS 3.1HIGH 8.4
  • TI-2018-15812 nmap version 6.49BETA6 through 7.60, up to and including SVN revision 37147 contains a… CVSS 3.0MEDIUM 5.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences