CVE-2026-42493

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk. Memory-wise small enough guests may still be okay to run.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 28, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

XSA-495 - Xen Security Advisories

http://xenbits.xen.org/xsa/advisory-495.html
generic

XSA-495 - Xen Security Advisories

https://xenbits.xenproject.org/xsa/advisory-495.html

Vendor Advisories for CVE-2026-42493(1)

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

Affected Packages

(8 across 8 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
xen—4.19.6-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
xen—4.20.4-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
xen—4.20.4-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
xen—4.21.2-r0—
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 ... 4.20.2+7-g1badcf5035-2 (6 versions)4.20.3+127-gc42374a105-0+deb13u1—
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 22× in last 7d / 91× 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 177 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42493?
CVE-2026-42493 is a high vulnerability published on July 28, 2026. Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still…
When was CVE-2026-42493 disclosed?
CVE-2026-42493 was first published in the National Vulnerability Database on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42493 actively exploited?
CVE-2026-42493 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 62.0% of all scored CVEs.
What is the CVSS score of CVE-2026-42493?
CVE-2026-42493 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42493?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42493, 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-2026-42493

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