CVE-2026-42488

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

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

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

CVSS v3
8.1
EG Score
8.1(high)
EPSS
27.4%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 22, 2026

Advisory Details (3)

Auto-updated Jun 18, 2026
No patch confirmed yet.
generic

XSA-494 - Xen Security Advisories

http://xenbits.xen.org/xsa/advisory-494.html
generic

oss-security - Xen Security Advisory 494 v3 (CVE-2026-42488) - x86: mismatched mapcache metadata

http://www.openwall.com/lists/oss-security/2026/06/09/14
generic

XSA-494 - Xen Security Advisories

https://xenbits.xenproject.org/xsa/advisory-494.html

Vendor Advisories for CVE-2026-42488(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 38× in last 7d / 85× 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. 2026-07-07 04:21 UTCEG score recompute
  2. 2026-07-07 04:21 UTCGHSA enrichment
  3. 2026-07-06 16:35 UTCEG score recompute
  4. 2026-07-06 16:35 UTCGHSA enrichment
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 04:56 UTCEG score recompute
  8. 2026-07-06 04:56 UTCGHSA enrichment
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-06 02:23 UTCEPSS rescore
  11. 2026-07-05 17:20 UTCEG score recompute
  12. 2026-07-05 17:20 UTCGHSA enrichment
  13. 2026-07-05 05:41 UTCEG score recompute
  14. 2026-07-05 05:40 UTCGHSA enrichment
  15. 2026-07-05 02:30 UTCEPSS rescore
  16. 2026-07-04 17:51 UTCEG score recompute
  17. 2026-07-04 17:51 UTCGHSA enrichment
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-04 06:08 UTCEG score recompute
  20. 2026-07-04 06:07 UTCGHSA enrichment
  21. 2026-07-03 18:10 UTCEG score recompute
  22. 2026-07-03 18:09 UTCGHSA enrichment
  23. 2026-07-03 06:31 UTCEG score recompute
  24. 2026-07-03 06:31 UTCGHSA enrichment
  25. 2026-07-02 18:53 UTCEG score recompute
Show 60 more
  1. 2026-07-02 18:53 UTCGHSA enrichment
  2. 2026-07-02 07:17 UTCEG score recompute
  3. 2026-07-02 07:17 UTCGHSA enrichment
  4. 2026-07-01 19:41 UTCEG score recompute
  5. 2026-07-01 19:41 UTCGHSA enrichment
  6. 2026-07-01 15:06 UTCEPSS rescore
  7. 2026-07-01 08:05 UTCEG score recompute
  8. 2026-07-01 08:05 UTCGHSA enrichment
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-30 20:27 UTCEG score recompute
  11. 2026-06-30 20:27 UTCGHSA enrichment
  12. 2026-06-30 08:52 UTCEG score recompute
  13. 2026-06-30 08:51 UTCGHSA enrichment
  14. 2026-06-29 21:15 UTCEG score recompute
  15. 2026-06-29 21:15 UTCGHSA enrichment
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-29 09:38 UTCEG score recompute
  18. 2026-06-29 09:38 UTCGHSA enrichment
  19. 2026-06-28 22:01 UTCEG score recompute
  20. 2026-06-28 22:01 UTCGHSA enrichment
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 10:25 UTCEG score recompute
  23. 2026-06-28 10:25 UTCGHSA enrichment
  24. 2026-06-28 04:56 UTCEPSS rescore
  25. 2026-06-27 22:47 UTCEG score recompute
  26. 2026-06-27 22:47 UTCGHSA enrichment
  27. 2026-06-27 11:10 UTCEG score recompute
  28. 2026-06-27 11:10 UTCGHSA enrichment
  29. 2026-06-27 03:08 UTCEPSS rescore
  30. 2026-06-26 23:34 UTCEG score recompute
  31. 2026-06-26 23:33 UTCGHSA enrichment
  32. 2026-06-26 11:58 UTCEG score recompute
  33. 2026-06-26 11:58 UTCGHSA enrichment
  34. 2026-06-26 00:21 UTCEG score recompute
  35. 2026-06-26 00:21 UTCGHSA enrichment
  36. 2026-06-25 13:49 UTCEPSS rescore
  37. 2026-06-25 13:49 UTCEPSS rescore
  38. 2026-06-25 12:38 UTCEG score recompute
  39. 2026-06-25 12:38 UTCGHSA enrichment
  40. 2026-06-25 01:02 UTCEG score recompute
  41. 2026-06-25 01:01 UTCGHSA enrichment
  42. 2026-06-24 14:05 UTCEPSS rescore
  43. 2026-06-24 13:25 UTCEG score recompute
  44. 2026-06-24 13:24 UTCGHSA enrichment
  45. 2026-06-24 01:48 UTCEG score recompute
  46. 2026-06-24 01:48 UTCGHSA enrichment
  47. 2026-06-23 21:33 UTCEPSS rescore
  48. 2026-06-23 14:12 UTCEG score recompute
  49. 2026-06-23 14:12 UTCGHSA enrichment
  50. 2026-06-23 02:35 UTCEG score recompute
  51. 2026-06-23 02:35 UTCGHSA enrichment
  52. 2026-06-22 14:56 UTCEG score recompute
  53. 2026-06-22 14:56 UTCGHSA enrichment
  54. 2026-06-22 03:10 UTCEG score recompute
  55. 2026-06-22 03:09 UTCGHSA enrichment
  56. 2026-06-21 15:32 UTCEG score recompute▲ 8.10
  57. 2026-06-21 15:32 UTCGHSA enrichment
  58. 2026-06-18 17:24 UTCNVD updateCVSS v3 → 8.1 · severity → HIGH
  59. 2026-06-18 15:45 UTCEG score recompute
  60. 2026-06-18 15:45 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42488?
CVE-2026-42488 is a high vulnerability published on June 18, 2026. Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.
When was CVE-2026-42488 disclosed?
CVE-2026-42488 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-2026-42488 actively exploited?
CVE-2026-42488 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42488?
CVE-2026-42488 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42488?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42488, 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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