CVE-2026-42489

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-06-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

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

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these operations may not be executed in parallel, so a system-wide lock is used. The way that lock is acquired is, however, not providing any fairness. This is CVE-2026-42489.

Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking. This is CVE-2026-42490.

CVSS v3
5.3
EG Score
5.3(high)
EPSS
0.2%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 22, 2026

Advisory Details (1)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

XSA-492 - Xen Security Advisories

https://xenbits.xenproject.org/xsa/advisory-492.html

Vendor Advisories for CVE-2026-42489(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 16× in last 7d / 38× 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. 2026-07-06 21:39 UTCEG score recompute
  2. 2026-07-06 21:39 UTCGHSA enrichment
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 17:23 UTCEG score recompute
  6. 2026-07-05 17:23 UTCGHSA enrichment
  7. 2026-07-04 15:30 UTCEG score recompute
  8. 2026-07-04 15:30 UTCGHSA enrichment
  9. 2026-07-03 13:36 UTCEG score recompute
  10. 2026-07-03 13:36 UTCGHSA enrichment
  11. 2026-07-02 11:44 UTCEG score recompute
  12. 2026-07-02 11:44 UTCGHSA enrichment
  13. 2026-07-01 09:51 UTCEG score recompute
  14. 2026-07-01 09:51 UTCGHSA enrichment
  15. 2026-06-30 07:58 UTCEG score recompute
  16. 2026-06-30 07:58 UTCGHSA enrichment
  17. 2026-06-29 06:05 UTCEG score recompute
  18. 2026-06-29 06:05 UTCGHSA enrichment
  19. 2026-06-28 14:07 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 04:10 UTCEG score recompute
  22. 2026-06-28 04:10 UTCGHSA enrichment
  23. 2026-06-27 02:16 UTCEG score recompute
  24. 2026-06-27 02:16 UTCGHSA enrichment
  25. 2026-06-26 00:22 UTCEG score recompute
Show 13 more
  1. 2026-06-26 00:22 UTCGHSA enrichment
  2. 2026-06-24 22:20 UTCEG score recompute
  3. 2026-06-24 22:20 UTCGHSA enrichment
  4. 2026-06-23 21:33 UTCEPSS rescore
  5. 2026-06-23 20:28 UTCEG score recompute
  6. 2026-06-23 20:27 UTCGHSA enrichment
  7. 2026-06-22 18:35 UTCEG score recompute
  8. 2026-06-22 18:35 UTCGHSA enrichment
  9. 2026-06-21 16:41 UTCEG score recompute▲ 5.30
  10. 2026-06-21 16:41 UTCGHSA enrichment
  11. 2026-06-18 17:24 UTCNVD updateCVSS v3 → 5.3 · severity → MEDIUM
  12. 2026-06-18 15:45 UTCEG score recompute
  13. 2026-06-18 15:45 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-42489?
CVE-2026-42489 is a medium vulnerability published on June 18, 2026. [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these…
When was CVE-2026-42489 disclosed?
CVE-2026-42489 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42489 actively exploited?
CVE-2026-42489 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42489?
CVE-2026-42489 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42489?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42489, 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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