CVE-2026-42899

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 2.4%, top 17% 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: cna:microsoft, epss
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: 2%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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%
Exploitation2% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
83%
KEV
Not listed

Published

May 12, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated May 13, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899

Vendor Advisories for CVE-2026-42899(18)

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

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunetstandard-targeting-pack-2.1-8.0 (8.0.127-0ubuntu1~24.04.1) @ noble2026-08-23ubuntu
redhatdotnet8.0-0:8.0.127-1.el9_62026-06-08redhat
redhatdotnet9.0-0:9.0.117-1.el10_02026-06-08redhat
redhatdotnet8.0-0:8.0.127-1.el9_42026-06-08redhat
redhatdotnet8.0-0:8.0.127-1.el10_02026-06-08redhat
redhatdotnet9.0-0:9.0.117-1.el9_62026-06-08redhat
redhatdotnet10.0-0:10.0.108-1.el10_22026-06-01redhat
redhatdotnet9.0-0:9.0.117-1.el10_22026-05-28redhat
redhatdotnet9.0-0:9.0.117-1.el8_102026-05-27redhat
redhatdotnet10.0-0:10.0.108-1.el9_82026-05-27redhat
redhatdotnet10.0-0:10.0.108-1.el8_102026-05-27redhat
redhatdotnet9.0-0:9.0.117-1.el9_82026-05-27redhat
redhatdotnet8.0-0:8.0.127-1.el10_22026-05-27redhat
redhatdotnet8.0-0:8.0.127-1.el8_102026-05-27redhat
redhatdotnet8.0-0:8.0.127-1.el9_82026-05-27redhat
redhatdotnet10-0-main-10.0.108-1.hum12026-05-14redhat
redhatdotnet9-0-main-9.0.117-1.hum12026-05-14redhat
redhatdotnet8-0-main-8.0.127-1.hum12026-05-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(12 across 1 ecosystem)
NuGet(12)
PackageVulnerable rangeFixed inDependents
Microsoft.AspNetCore.App.Runtime.linux-arm10.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.linux-arm6410.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.linux-musl-arm10.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.linux-musl-arm6410.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.linux-musl-x649.0.0 ... 9.0.9 (16 versions)9.0.16—
Microsoft.AspNetCore.App.Runtime.linux-x6410.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.osx-arm6410.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.osx-x6410.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.win-arm—10.0.8—
Microsoft.AspNetCore.App.Runtime.win-arm6410.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.win-x6410.0.0 ... 10.0.7 (8 versions)10.0.8—
Microsoft.AspNetCore.App.Runtime.win-x8610.0.0 ... 10.0.7 (8 versions)10.0.8—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 65× 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 188 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-42899?
CVE-2026-42899 is a high vulnerability published on May 12, 2026. Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.
When was CVE-2026-42899 disclosed?
CVE-2026-42899 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42899 actively exploited?
CVE-2026-42899 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 17.0% of all scored CVEs.
What is the CVSS score of CVE-2026-42899?
CVE-2026-42899 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42899?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42899, 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-2026-42899

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