CVE-2026-58058

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-06-28. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
60(Attend)
EG Risk 60/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
20.0%
KEV
Not listed

Published

June 28, 2026

Last Modified

June 30, 2026

Advisory Details (4)

Auto-updated Jun 28, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic🟡 PoC Available

Nmap - Integer Underflow in IPv6 Extension Header Parsing | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nmap-integer-underflow-in-ipv6-extension-header-parsing
generic

Nmap Change Log

https://nmap.org/changelog.html
github_commit

commit bb6754e76bb1 (nmap/nmap)

Fix landed in nmap/nmap commit bb6754e76bb1 — awaiting tagged release

https://github.com/nmap/nmap/commit/bb6754e76bb1686315008e1aa1c40202a513fb83
generic🟡 PoC Available

exploitarium/nmap-ipv6-extlen-wrap-poc at main · bikini/exploitarium · GitHub

https://github.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-poc

Vendor Advisories for CVE-2026-58058(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 69× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:20 UTCEG score recompute
  4. 2026-07-22 14:08 UTCEPSS rescore
  5. 2026-07-22 14:08 UTCEPSS rescore
  6. 2026-07-21 15:25 UTCEPSS rescore
  7. 2026-07-20 17:08 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 14:31 UTCEPSS rescore
  10. 2026-07-19 02:29 UTCEPSS rescore
  11. 2026-07-18 10:04 UTCEPSS rescore
  12. 2026-07-16 17:03 UTCEPSS rescore
  13. 2026-07-16 16:04 UTCVendor advisory
  14. 2026-07-16 16:04 UTCGHSA enrichment
  15. 2026-07-15 16:57 UTCEPSS rescore
  16. 2026-07-15 16:57 UTCEPSS rescore
  17. 2026-07-15 15:15 UTCVendor advisory
  18. 2026-07-15 15:15 UTCGHSA enrichment
  19. 2026-07-15 02:00 UTCEPSS rescore
  20. 2026-07-15 02:00 UTCEPSS rescore
  21. 2026-07-14 14:29 UTCVendor advisory
  22. 2026-07-14 14:28 UTCGHSA enrichment
  23. 2026-07-13 22:31 UTCEPSS rescore
  24. 2026-07-13 13:44 UTCGHSA enrichment
  25. 2026-07-13 06:13 UTCEPSS rescore
Show 44 more
  1. 2026-07-13 06:13 UTCEPSS rescore
  2. 2026-07-12 12:59 UTCVendor advisory
  3. 2026-07-12 12:59 UTCGHSA enrichment
  4. 2026-07-12 05:46 UTCEPSS rescore
  5. 2026-07-11 12:16 UTCVendor advisory
  6. 2026-07-11 12:15 UTCGHSA enrichment
  7. 2026-07-11 08:27 UTCEPSS rescore
  8. 2026-07-11 08:27 UTCEPSS rescore
  9. 2026-07-10 11:32 UTCVendor advisory
  10. 2026-07-10 11:32 UTCGHSA enrichment
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-09 19:10 UTCEPSS rescore
  13. 2026-07-09 10:46 UTCVendor advisory
  14. 2026-07-09 10:46 UTCGHSA enrichment
  15. 2026-07-08 10:03 UTCVendor advisory
  16. 2026-07-08 10:02 UTCGHSA enrichment
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-07 13:46 UTCEPSS rescore
  19. 2026-07-07 09:19 UTCVendor advisory
  20. 2026-07-07 09:19 UTCGHSA enrichment
  21. 2026-07-06 16:27 UTCEPSS rescore
  22. 2026-07-06 16:27 UTCEPSS rescore
  23. 2026-07-06 08:35 UTCVendor advisory
  24. 2026-07-06 08:34 UTCGHSA enrichment
  25. 2026-07-06 02:23 UTCEPSS rescore
  26. 2026-07-06 02:23 UTCEPSS rescore
  27. 2026-07-05 07:44 UTCVendor advisory
  28. 2026-07-05 07:43 UTCGHSA enrichment
  29. 2026-07-05 02:31 UTCEPSS rescore
  30. 2026-07-05 02:30 UTCEPSS rescore
  31. 2026-07-04 06:58 UTCGHSA enrichment
  32. 2026-07-04 06:31 UTCEPSS rescore
  33. 2026-07-04 06:31 UTCEPSS rescore
  34. 2026-07-03 05:53 UTCGHSA enrichment
  35. 2026-07-02 05:09 UTCGHSA enrichment
  36. 2026-07-01 15:07 UTCEPSS rescore
  37. 2026-07-01 04:26 UTCGHSA enrichment
  38. 2026-06-30 23:22 UTCEPSS rescore
  39. 2026-06-30 03:38 UTCGHSA enrichment
  40. 2026-06-29 14:06 UTCEPSS rescore
  41. 2026-06-29 02:53 UTCGHSA enrichment
  42. 2026-06-28 14:07 UTCEPSS rescore
  43. 2026-06-28 02:10 UTCEG score recompute
  44. 2026-06-28 02:09 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-58058?
CVE-2026-58058 is a medium vulnerability published on June 28, 2026. Nmap through 7.99 does not keep the IPv6 extension-header walk within the captured packet in ipv6getdata_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…
When was CVE-2026-58058 disclosed?
CVE-2026-58058 was first published in the National Vulnerability Database on June 28, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58058 actively exploited?
CVE-2026-58058 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58058?
CVE-2026-58058 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-58058?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58058, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-58058

Explore →

Is Your Infrastructure Affected by CVE-2026-58058?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs