CVE-2025-71401

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreHIGH 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
Trending — 3 sources updated this week
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(high)
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

August 3, 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 23× in last 7d / 62× 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.

  1. 2026-08-21 07:12 UTCEG score recompute
  2. 2026-08-21 07:12 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 07:43 UTCEG score recompute
  5. 2026-08-20 07:43 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 08:14 UTCEG score recompute
  8. 2026-08-19 08:14 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 08:46 UTCEG score recompute
  11. 2026-08-18 08:46 UTCGHSA enrichment
  12. 2026-08-17 13:46 UTCEPSS rescore
  13. 2026-08-17 09:18 UTCEG score recompute
  14. 2026-08-17 09:18 UTCGHSA enrichment
  15. 2026-08-16 14:55 UTCEPSS rescore
  16. 2026-08-16 09:50 UTCEG score recompute
  17. 2026-08-16 09:50 UTCGHSA enrichment
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 10:22 UTCEG score recompute
  20. 2026-08-15 10:22 UTCGHSA enrichment
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 10:53 UTCEG score recompute
  23. 2026-08-14 10:53 UTCGHSA enrichment
  24. 2026-08-13 22:00 UTCEPSS rescore
  25. 2026-08-13 11:24 UTCEG score recompute
Show 37 more
  1. 2026-08-13 11:24 UTCGHSA enrichment
  2. 2026-08-12 13:50 UTCEPSS rescore
  3. 2026-08-12 11:56 UTCEG score recompute
  4. 2026-08-12 11:56 UTCGHSA enrichment
  5. 2026-08-11 13:42 UTCEPSS rescore
  6. 2026-08-11 12:27 UTCEG score recompute
  7. 2026-08-11 12:27 UTCGHSA enrichment
  8. 2026-08-10 23:59 UTCEPSS rescore
  9. 2026-08-10 12:57 UTCEG score recompute
  10. 2026-08-10 12:57 UTCGHSA enrichment
  11. 2026-08-09 13:46 UTCEPSS rescore
  12. 2026-08-09 13:29 UTCEG score recompute
  13. 2026-08-09 13:29 UTCGHSA enrichment
  14. 2026-08-08 16:36 UTCEPSS rescore
  15. 2026-08-08 14:01 UTCEG score recompute
  16. 2026-08-08 14:01 UTCGHSA enrichment
  17. 2026-08-07 16:27 UTCEPSS rescore
  18. 2026-08-07 14:32 UTCGHSA enrichment
  19. 2026-08-06 15:04 UTCEG score recompute
  20. 2026-08-06 15:04 UTCGHSA enrichment
  21. 2026-08-06 13:46 UTCEPSS rescore
  22. 2026-08-05 19:17 UTCEPSS rescore
  23. 2026-08-05 15:34 UTCGHSA enrichment
  24. 2026-08-04 16:05 UTCEG score recompute
  25. 2026-08-04 16:05 UTCGHSA enrichment
  26. 2026-08-04 10:37 UTCEPSS rescore
  27. 2026-08-03 16:36 UTCEG score recompute
  28. 2026-08-03 16:36 UTCGHSA enrichment
  29. 2026-08-03 15:28 UTCEG score recompute
  30. 2026-08-03 15:28 UTCGHSA enrichment
  31. 2026-08-03 12:32 UTCEG score recompute
  32. 2026-08-03 12:32 UTCGHSA enrichment
  33. 2026-08-03 11:28 UTCEG score recompute
  34. 2026-08-03 11:27 UTCGHSA enrichment
  35. 2026-08-02 13:30 UTCEG score recompute
  36. 2026-08-02 12:39 UTCEG score recompute
  37. 2026-08-02 12:38 UTCMITRE cvelistV5first tracked

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 August 3, 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 82.1% 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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