CVE-2026-14631

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 57% 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

webpack-dev-server versions 5.2.5 and earlier terminate the whole Node.js process when an unauthenticated peer sends either a normal HTTP request with a malformed Host header or a WebSocket upgrade to the default /ws endpoint with a malformed Origin header. The malformed value causes an uncaught exception in the host-validation path and crashes the dev server. Impact is limited to availability of the development server, no data disclosure, no code execution. Patches: upgrade to webpack-dev-server 5.2.6. Workarounds: keep the dev server bound to localhost (the default) and do not expose it to untrusted networks.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (2)

Auto-updated Jul 3, 2026
Patch available. Sources: github.
githubMentions a patch (unverified)

webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header · Advisory · webpack/webpack-dev-server · GitHub

https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html

Vendor Advisories for CVE-2026-14631(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
webpack-dev-server—
  • every version up to 5.2.6: fixed in 5.2.6
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 25× 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 124 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-14631?
CVE-2026-14631 is a medium vulnerability published on July 3, 2026. webpack-dev-server versions 5.2.5 and earlier terminate the whole Node.js process when an unauthenticated peer sends either a normal HTTP request with a malformed Host header or a WebSocket upgrade to the default /ws endpoint with a malformed Origin header. The malformed value causes an uncaught…
When was CVE-2026-14631 disclosed?
CVE-2026-14631 was first published on July 3, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14631 actively exploited?
CVE-2026-14631 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-14631?
CVE-2026-14631 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-14631?
A fix for CVE-2026-14631 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-14631 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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