CVE-2026-42342

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 78% 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: epss, secondary
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

A fix is available — apply it.

React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`) or Data Mode (createBrowserRouter/`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.

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
22%
KEV
Not listed

Published

June 2, 2026

Last Modified

July 21, 2026

Advisory Details (1)

Auto-updated Jun 6, 2026
Patch available. Sources: github.
github Patch Available

DoS via unbounded path expansion in __manifest endpoint · Advisory · remix-run/react-router · GitHub

https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78

Vendor Advisories for CVE-2026-42342(8)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatodf4/rook-ceph-rhel9-operator:17867068802026-08-18redhat
redhatodf4/rook-ceph-rhel9-operator:17867031432026-08-18redhat
redhatmta/mta-ui-rhel9:17851690132026-08-04redhat
redhatdevspaces/openvsx-rhel9:17849829102026-07-29redhat
redhatreact-router2026-07-20redhat
redhatrhtas/rhtas-console-ui-rhel9:17841058942026-07-20redhat

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

(2 across 1 ecosystem)
npm(2)
PackageVulnerable rangeFixed inDependents
react-router—7.15.0—
@remix-run/server-runtime—2.17.5—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× 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 171 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-42342?
CVE-2026-42342 is a high vulnerability published on June 2, 2026. React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the manifest endpoint, resulting in response…
When was CVE-2026-42342 disclosed?
CVE-2026-42342 was first published in the National Vulnerability Database on June 2, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42342 actively exploited?
CVE-2026-42342 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 77.8% of all scored CVEs.
What is the CVSS score of CVE-2026-42342?
CVE-2026-42342 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-42342?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42342, 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-2026-42342

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