IPv6 Extension Header Parsing · Nmap - Integer Underflow
Affects nmapSource GCVE Database
Not known to be exploited · public exploit available (Exploit-DB).
Data as of 26 Oct 2026, 09:16 UTC
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
Disclosed: evidence found.
CVE published 28 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE published
on cve.org
, t = 0
In Threat Radar
record ingested
, 44 hours after disclosure
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
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu:14.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=trustyOther threats | Affected
| Fixed in– |
Ubuntu:16.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=xenialOther threats | Affected
| Fixed in– |
Ubuntu:18.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=bionicOther threats | Affected
| Fixed in– |
Ubuntu:20.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Ubuntu:22.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu:24.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu:25.10nmappkg:deb/ubuntu/nmap?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu:26.10nmappkg:deb/ubuntu/nmap?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu:26.04:LTSnmappkg:deb/ubuntu/nmap?arch=source&distro=resoluteOther threats | Affected
| 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 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
- wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2098.json (opens in a new tab)
- wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2098 (opens in a new tab)
- github.com/advisories/GHSA-wxvj-hc4r-fq45 (opens in a new tab)
- bodhi.fedoraproject.org/updates/FEDORA-2026-3b30fa1da4 (opens in a new tab)
- bodhi.fedoraproject.org/updates/FEDORA-2026-0245fd9f84 (opens in a new tab)
- bodhi.fedoraproject.org/updates/FEDORA-2026-602d919dbc (opens in a new tab)
- ubuntu.com/security/CVE-2026-58058 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-58058 (opens in a new tab)
- github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc (opens in a new tab)
- github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83 (opens in a new tab)
- nmap.org/changelog.html (opens in a new tab)
- vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing (opens in a new tab)