CVE-2026-42489

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 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(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

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
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
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.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
xen—4.18.5-r9—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
xen—4.19.5-r4—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
xen—4.20.3-r4—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
xen—4.20.3-r4—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
xen—4.21.1-r6—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
xen4.14.2+25-gb6a8c4f72d-2 ... 4.20.3+127-gc42374a105-1 (46 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
xen4.17.1+2-gb773c48e36-1 ... 4.20.3+127-gc42374a105-1 (25 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
xen4.20.0+68-g35cb38b222-1 ... 4.20.3+127-gc42374a105-1 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
xen4.20.0+68-g35cb38b222-1, 4.20.2+37-g61ff35323e-1, 4.20.2+7-g1badcf5035-1, 4.20.2+7-g1badcf5035-24.20.3+127-gc42374a105-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 53× 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.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-08-25 07:06 UTCEG score recompute
  2. 2026-08-25 07:06 UTCGHSA enrichment
  3. 2026-08-24 05:11 UTCGHSA enrichment
  4. 2026-08-23 01:13 UTCEG score recompute
  5. 2026-08-23 01:12 UTCGHSA enrichment
  6. 2026-08-23 00:19 UTCEPSS rescore
  7. 2026-08-21 11:53 UTCEG score recompute
  8. 2026-08-21 11:53 UTCGHSA enrichment
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-20 09:37 UTCGHSA enrichment
  11. 2026-08-19 07:44 UTCGHSA enrichment
  12. 2026-08-17 15:33 UTCEG score recompute
  13. 2026-08-17 15:33 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 13:40 UTCEG score recompute
  16. 2026-08-16 13:40 UTCGHSA enrichment
  17. 2026-08-16 02:14 UTCEPSS rescore
  18. 2026-08-15 11:35 UTCGHSA enrichment
  19. 2026-08-14 09:42 UTCGHSA enrichment
  20. 2026-08-13 07:49 UTCGHSA enrichment
  21. 2026-08-12 05:26 UTCEG score recompute
  22. 2026-08-12 05:26 UTCGHSA enrichment
  23. 2026-08-11 13:43 UTCEPSS rescore
  24. 2026-08-11 03:33 UTCGHSA enrichment
  25. 2026-08-10 01:40 UTCGHSA enrichment
Show 75 more
  1. 2026-08-08 23:48 UTCEG score recompute
  2. 2026-08-08 23:48 UTCGHSA enrichment
  3. 2026-08-08 16:37 UTCEPSS rescore
  4. 2026-08-07 21:55 UTCEG score recompute
  5. 2026-08-07 21:55 UTCGHSA enrichment
  6. 2026-08-06 20:03 UTCEG score recompute
  7. 2026-08-06 20:03 UTCGHSA enrichment
  8. 2026-08-06 13:46 UTCEPSS rescore
  9. 2026-08-05 19:17 UTCEPSS rescore
  10. 2026-08-05 18:10 UTCGHSA enrichment
  11. 2026-08-04 16:18 UTCEG score recompute
  12. 2026-08-04 16:18 UTCGHSA enrichment
  13. 2026-08-04 10:38 UTCEPSS rescore
  14. 2026-08-03 14:23 UTCGHSA enrichment
  15. 2026-08-02 09:47 UTCEG score recompute
  16. 2026-08-02 09:47 UTCGHSA enrichment
  17. 2026-08-02 02:27 UTCEPSS rescore
  18. 2026-08-01 07:53 UTCEG score recompute
  19. 2026-08-01 07:53 UTCGHSA enrichment
  20. 2026-08-01 04:16 UTCEPSS rescore
  21. 2026-07-31 05:33 UTCEG score recompute
  22. 2026-07-31 05:33 UTCGHSA enrichment
  23. 2026-07-30 16:28 UTCEPSS rescore
  24. 2026-07-30 03:40 UTCGHSA enrichment
  25. 2026-07-29 01:46 UTCEG score recompute
  26. 2026-07-29 01:46 UTCGHSA enrichment
  27. 2026-07-28 15:36 UTCEPSS rescore
  28. 2026-07-27 22:14 UTCGHSA enrichment
  29. 2026-07-26 17:42 UTCEG score recompute
  30. 2026-07-26 17:41 UTCGHSA enrichment
  31. 2026-07-26 14:54 UTCEPSS rescore
  32. 2026-07-26 14:54 UTCEPSS rescore
  33. 2026-07-25 14:18 UTCEPSS rescore
  34. 2026-07-24 14:17 UTCEPSS rescore
  35. 2026-07-23 03:11 UTCEG score recompute
  36. 2026-07-22 14:08 UTCEPSS rescore
  37. 2026-07-18 10:04 UTCEPSS rescore
  38. 2026-07-16 21:03 UTCGHSA enrichment
  39. 2026-07-16 17:03 UTCEPSS rescore
  40. 2026-07-15 13:19 UTCGHSA enrichment
  41. 2026-07-14 11:25 UTCGHSA enrichment
  42. 2026-07-13 22:30 UTCEPSS rescore
  43. 2026-07-13 09:32 UTCGHSA enrichment
  44. 2026-07-12 07:39 UTCGHSA enrichment
  45. 2026-07-12 05:46 UTCEPSS rescore
  46. 2026-07-11 08:27 UTCEPSS rescore
  47. 2026-07-11 05:46 UTCGHSA enrichment
  48. 2026-07-10 03:54 UTCGHSA enrichment
  49. 2026-07-09 19:10 UTCEPSS rescore
  50. 2026-07-09 01:49 UTCGHSA enrichment
  51. 2026-07-08 15:15 UTCEPSS rescore
  52. 2026-07-07 23:33 UTCGHSA enrichment
  53. 2026-07-07 13:46 UTCEPSS rescore
  54. 2026-07-06 21:39 UTCGHSA enrichment
  55. 2026-07-06 02:23 UTCEPSS rescore
  56. 2026-07-06 02:23 UTCEPSS rescore
  57. 2026-07-05 17:23 UTCGHSA enrichment
  58. 2026-07-04 15:30 UTCGHSA enrichment
  59. 2026-07-03 13:36 UTCGHSA enrichment
  60. 2026-07-02 11:44 UTCGHSA enrichment
  61. 2026-07-01 09:51 UTCGHSA enrichment
  62. 2026-06-30 07:58 UTCGHSA enrichment
  63. 2026-06-29 06:05 UTCGHSA enrichment
  64. 2026-06-28 14:07 UTCEPSS rescore
  65. 2026-06-28 04:56 UTCEPSS rescore
  66. 2026-06-28 04:10 UTCGHSA enrichment
  67. 2026-06-27 02:16 UTCGHSA enrichment
  68. 2026-06-26 00:22 UTCGHSA enrichment
  69. 2026-06-24 22:20 UTCGHSA enrichment
  70. 2026-06-23 21:33 UTCEPSS rescore
  71. 2026-06-23 20:27 UTCGHSA enrichment
  72. 2026-06-22 18:35 UTCGHSA enrichment
  73. 2026-06-21 16:41 UTCEG score recompute▲ 5.30
  74. 2026-06-21 16:41 UTCGHSA enrichment
  75. 2026-06-18 17:24 UTCNVD updateCVSS v3 → 5.3 · severity → MEDIUM

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% probability of exploitation in the next 30 days, which ranks it in the top 99.8% of all scored CVEs.
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-42489

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