CVE-2025-71401

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-02. a secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0

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

better-auth (npm) before 1.4.2 allows an external request to configure baseURL when it is not otherwise defined (e.g., BETTER_AUTH_URL is unset). An attacker able to make the very first request to the server after startup can poison the router's base path, causing all routes to return 404 for all users (denial of service). The issue is not reachable when baseURL is explicitly configured or on typical managed hosting platforms.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

August 2, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Aug 2, 2026
Patch available. Sources: github.
generic

better-auth before 1.4.1 basePath Modification DoS | Advisories | VulnCheck

https://www.vulncheck.com/advisories/better-auth-before-basepath-modification-dos
github Patch Available

External request basePath modification DoS · Advisory · better-auth/better-auth · GitHub

https://github.com/better-auth/better-auth/security/advisories/GHSA-569q-mpph-wgww

Vendor Advisories for CVE-2025-71401(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 rangeFixed inDependents
better-auth—1.4.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 60× 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 119 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2025-71401?
CVE-2025-71401 is a medium vulnerability published on August 2, 2026. better-auth (npm) before 1.4.2 allows an external request to configure baseURL when it is not otherwise defined (e.g., BETTERAUTHURL is unset). An attacker able to make the very first request to the server after startup can poison the router's base path, causing all routes to return 404 for all…
When was CVE-2025-71401 disclosed?
CVE-2025-71401 was first published in the National Vulnerability Database on August 2, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-71401 actively exploited?
CVE-2025-71401 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 81.9% of all scored CVEs.
What is the CVSS score of CVE-2025-71401?
CVE-2025-71401 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2025-71401?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-71401, 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-2025-71401

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