CVE-2026-23556

CRITICALPre-NVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 97% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.4Exploit: NoneExposed: 0

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

When oxenstored is tearing a domain down, the node data is cleaned up but the usage counts are leaked.

When the domain ID is eventually reused, the new domain can create fewer nodes before beeing deemed to be over quota.

CVSS v3
9.4
EG Score
9.4(medium)
EPSS
3.5%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 9, 2026

Advisory Details (1)

Auto-updated Jul 9, 2026
No patch confirmed yet.
generic

XSA-483 - Xen Security Advisories

https://xenbits.xen.org/xsa/advisory-483.html

Vendor Advisories for CVE-2026-23556(1)

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 31× in last 7d / 31× 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. 2026-07-12 01:43 UTCEG score recompute
  2. 2026-07-12 01:43 UTCGHSA enrichment
  3. 2026-07-11 21:33 UTCEG score recompute
  4. 2026-07-11 21:33 UTCGHSA enrichment
  5. 2026-07-11 17:25 UTCEG score recompute
  6. 2026-07-11 17:25 UTCGHSA enrichment
  7. 2026-07-11 13:16 UTCEG score recompute
  8. 2026-07-11 13:16 UTCGHSA enrichment
  9. 2026-07-11 09:07 UTCEG score recompute
  10. 2026-07-11 09:07 UTCGHSA enrichment
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-11 04:59 UTCEG score recompute
  13. 2026-07-11 04:58 UTCGHSA enrichment
  14. 2026-07-11 00:49 UTCEG score recompute
  15. 2026-07-11 00:49 UTCGHSA enrichment
  16. 2026-07-10 20:40 UTCEG score recompute
  17. 2026-07-10 20:40 UTCGHSA enrichment
  18. 2026-07-10 16:30 UTCEG score recompute
  19. 2026-07-10 16:30 UTCGHSA enrichment
  20. 2026-07-10 12:22 UTCEG score recompute
  21. 2026-07-10 12:22 UTCGHSA enrichment
  22. 2026-07-10 08:12 UTCEG score recompute
  23. 2026-07-10 08:12 UTCGHSA enrichment
  24. 2026-07-10 04:04 UTCEG score recompute
  25. 2026-07-10 04:04 UTCGHSA enrichment
Show 6 more
  1. 2026-07-09 23:55 UTCEG score recompute
  2. 2026-07-09 23:55 UTCGHSA enrichment
  3. 2026-07-09 19:46 UTCEG score recompute
  4. 2026-07-09 19:46 UTCGHSA enrichment
  5. 2026-07-09 15:37 UTCEG score recompute
  6. 2026-07-09 15:35 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-23556?
CVE-2026-23556 is a critical vulnerability published on July 9, 2026. When oxenstored is tearing a domain down, the node data is cleaned up but the usage counts are leaked. When the domain ID is eventually reused, the new domain can create fewer nodes before beeing deemed to be over quota.
When was CVE-2026-23556 disclosed?
CVE-2026-23556 was first published in the National Vulnerability Database on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23556 actively exploited?
CVE-2026-23556 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23556?
CVE-2026-23556 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-23556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23556, 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

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