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CVE-2026-58058VulnerabilityPublished

IPv6 Extension Header Parsing · Nmap - Integer Underflow

Affects nmapSource GCVE Database

0

Not known to be exploited · public exploit available (Exploit-DB).

Data as of 26 Oct 2026, 09:16 UTC

Severity
Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
1.4% chance of exploitation in 30 days – higher than 73% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 28 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  4. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE published

    on cve.org

    , t = 0

  2. In Threat Radar

    record ingested

    , 44 hours after disclosure

  3. First Exploit-DB entry (opens in a new tab)

    Nmap 7.99 - Extension Header Integer Underflow

    , 50 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu:14.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=trustyOther threatsAffected
  • =6.40-0.1ubuntu1
  • =6.40-0.2ubuntu1
Fixed in–
Ubuntu:16.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=xenialOther threatsAffected
  • =6.47-7
  • =7.01-2ubuntu1
  • =7.01-2ubuntu2
Fixed in–
Ubuntu:18.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=bionicOther threatsAffected
  • =7.60-1ubuntu1
  • =7.60-1ubuntu2
  • =7.60-1ubuntu3
  • =7.60-1ubuntu4
  • =7.60-1ubuntu5
Fixed in–
Ubuntu:20.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=focalOther threatsAffected
  • =7.80+dfsg1-1build1
  • =7.80+dfsg1-1build2
  • =7.80+dfsg1-2
  • =7.80+dfsg1-2build1
  • =7.80+dfsg1-2ubuntu0.1
Fixed in–
Ubuntu:22.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=jammyOther threatsAffected
  • =7.91+dfsg1+really7.80+dfsg1-2
  • =7.91+dfsg1+really7.80+dfsg1-2build1
  • =7.91+dfsg1+really7.80+dfsg1-2ubuntu0.1
Fixed in–
Ubuntu:24.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=nobleOther threatsAffected
  • =7.94+git20230807.3be01efb1+dfsg-1
  • =7.94+git20230807.3be01efb1+dfsg-2
  • =7.94+git20230807.3be01efb1+dfsg-3
  • =7.94+git20230807.3be01efb1+dfsg-3build1
  • =7.94+git20230807.3be01efb1+dfsg-3build2
Fixed in–
Ubuntu:25.10nmappkg:deb/ubuntu/nmap?arch=source&distro=questingOther threatsAffected
  • =7.95+dfsg-2
  • =7.95+dfsg-3
Fixed in–
Ubuntu:26.10nmappkg:deb/ubuntu/nmap?arch=source&distro=stonkingOther threatsAffected
  • =7.98+dfsg-1
  • =7.99+dfsg-1ubuntu1
  • =7.99+dfsg-1ubuntu2
Fixed in–
Ubuntu:26.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=resoluteOther threatsAffected
  • =7.95+dfsg-3
  • =7.98+dfsg-1
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until a patch is available, users should monitor official Fedora and Nmap advisories for updates. No official fixes or temporary mitigations have been published.

Description

CVE-2026-58058 is an integer underflow vulnerability in Nmap on Fedora Linux that can lead to a denial of service condition. The vulnerability is rated medium severity. There is no CVSS score or patch information currently available. Public exploit code exists but no known exploitation in the wild has been reported.

Indicators of compromise

Exploit source code

Exploit code for Nmap 7.99 - Extension Header Integer Underflow3,430 characters
# Exploit Title:         Nmap  7.99  - Extension Header Integer Underflow  
# CVE:                   CVE-2026-58058
# Date:                  2026-06-29
# Exploit Author:        Mohammed Idrees Banyamer
# Author Country:        Jordan
# Instagram:             @banyamer_security
# Author GitHub:         https://github.com/mbanyamer
# Author Blog  :         https://banyamersecurity.com/blog/
# Vendor Homepage:       https://nmap.org
# Software Link:         https://nmap.org/download
# Affected:    …

References

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