CVE-2025-71399

HIGHPre-NVD 8.68.6—
EchelonGraph scoreHIGH confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-08-02. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: None knownExposed: 0

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

Better Auth relies on better-call, which uses the rou3 router library. In affected versions of rou3, paths are normalized by removing empty segments, so /path, //path, and ///path resolve to the same route. In Better Auth versions prior to 1.4.5 (which bundles the fixed rou3), this can allow attackers to bypass disabledPaths configuration and path-based rate limits by submitting requests with extra slashes in the URL path. The issue does not apply in deployments where the proxy or platform normalizes URLs by collapsing multiple slashes.

CVSS v3
8.6
EG Score
8.6(high)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
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 1.4.4 Path Normalization Bypass via rou3 | Advisories | VulnCheck

https://www.vulncheck.com/advisories/better-auth-before-path-normalization-bypass-via-rou3
github Patch Available

Double-Slash Path Normalization in rou3 Can Bypass Better Auth disabledPaths config and Rate Limits · Advisory · better-auth/better-auth · GitHub

https://github.com/better-auth/better-auth/security/advisories/GHSA-x732-6j76-qmhm

Vendor Advisories for CVE-2025-71399(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—1.4.5—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 84× 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 04:46 UTCEG score recompute
  2. 2026-08-21 04:46 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 17:32 UTCGHSA enrichment
  5. 2026-08-20 06:18 UTCGHSA enrichment
  6. 2026-08-19 19:02 UTCEG score recompute
  7. 2026-08-19 19:02 UTCGHSA enrichment
  8. 2026-08-19 17:03 UTCEPSS rescore
  9. 2026-08-19 05:35 UTCGHSA enrichment
  10. 2026-08-18 18:21 UTCEG score recompute
  11. 2026-08-18 18:21 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 06:52 UTCGHSA enrichment
  14. 2026-08-17 19:38 UTCEG score recompute
  15. 2026-08-17 19:38 UTCGHSA enrichment
  16. 2026-08-17 13:46 UTCEPSS rescore
  17. 2026-08-17 07:32 UTCGHSA enrichment
  18. 2026-08-16 20:18 UTCEG score recompute
  19. 2026-08-16 20:18 UTCGHSA enrichment
  20. 2026-08-16 14:55 UTCEPSS rescore
  21. 2026-08-16 09:04 UTCEG score recompute
  22. 2026-08-16 09:04 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 21:50 UTCGHSA enrichment
  25. 2026-08-15 10:36 UTCEG score recompute
Show 59 more
  1. 2026-08-15 10:36 UTCGHSA enrichment
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-14 23:22 UTCGHSA enrichment
  4. 2026-08-14 12:08 UTCGHSA enrichment
  5. 2026-08-14 00:54 UTCEG score recompute
  6. 2026-08-14 00:54 UTCGHSA enrichment
  7. 2026-08-13 22:00 UTCEPSS rescore
  8. 2026-08-13 13:40 UTCGHSA enrichment
  9. 2026-08-13 02:23 UTCGHSA enrichment
  10. 2026-08-12 15:09 UTCEG score recompute
  11. 2026-08-12 15:09 UTCGHSA enrichment
  12. 2026-08-12 13:50 UTCEPSS rescore
  13. 2026-08-12 03:55 UTCGHSA enrichment
  14. 2026-08-11 16:41 UTCEG score recompute
  15. 2026-08-11 16:41 UTCGHSA enrichment
  16. 2026-08-11 13:42 UTCEPSS rescore
  17. 2026-08-11 05:27 UTCEG score recompute
  18. 2026-08-11 05:27 UTCGHSA enrichment
  19. 2026-08-10 23:59 UTCEPSS rescore
  20. 2026-08-10 18:13 UTCGHSA enrichment
  21. 2026-08-10 06:59 UTCGHSA enrichment
  22. 2026-08-09 19:45 UTCEG score recompute
  23. 2026-08-09 19:45 UTCGHSA enrichment
  24. 2026-08-09 13:46 UTCEPSS rescore
  25. 2026-08-09 08:32 UTCGHSA enrichment
  26. 2026-08-08 21:18 UTCEG score recompute
  27. 2026-08-08 21:18 UTCGHSA enrichment
  28. 2026-08-08 16:36 UTCEPSS rescore
  29. 2026-08-08 10:04 UTCGHSA enrichment
  30. 2026-08-07 22:50 UTCEG score recompute
  31. 2026-08-07 22:50 UTCGHSA enrichment
  32. 2026-08-07 16:27 UTCEPSS rescore
  33. 2026-08-07 11:36 UTCGHSA enrichment
  34. 2026-08-07 00:21 UTCEG score recompute
  35. 2026-08-07 00:21 UTCGHSA enrichment
  36. 2026-08-06 13:46 UTCEPSS rescore
  37. 2026-08-06 13:07 UTCGHSA enrichment
  38. 2026-08-06 01:53 UTCEG score recompute
  39. 2026-08-06 01:53 UTCGHSA enrichment
  40. 2026-08-05 19:17 UTCEPSS rescore
  41. 2026-08-05 14:39 UTCGHSA enrichment
  42. 2026-08-05 03:22 UTCGHSA enrichment
  43. 2026-08-04 16:08 UTCEG score recompute
  44. 2026-08-04 16:08 UTCGHSA enrichment
  45. 2026-08-04 10:37 UTCEPSS rescore
  46. 2026-08-04 04:54 UTCGHSA enrichment
  47. 2026-08-03 17:40 UTCEG score recompute
  48. 2026-08-03 17:40 UTCGHSA enrichment
  49. 2026-08-03 16:19 UTCEG score recompute
  50. 2026-08-03 16:19 UTCGHSA enrichment
  51. 2026-08-03 12:32 UTCEG score recompute
  52. 2026-08-03 12:32 UTCGHSA enrichment
  53. 2026-08-03 11:28 UTCEG score recompute
  54. 2026-08-03 11:27 UTCGHSA enrichment
  55. 2026-08-03 00:44 UTCEG score recompute
  56. 2026-08-03 00:44 UTCGHSA enrichment
  57. 2026-08-02 13:30 UTCEG score recompute
  58. 2026-08-02 12:39 UTCEG score recompute
  59. 2026-08-02 12:38 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2025-71399?
CVE-2025-71399 is a high vulnerability published on August 2, 2026. Better Auth relies on better-call, which uses the rou3 router library. In affected versions of rou3, paths are normalized by removing empty segments, so /path, //path, and ///path resolve to the same route. In Better Auth versions prior to 1.4.5 (which bundles the fixed rou3), this can allow…
When was CVE-2025-71399 disclosed?
CVE-2025-71399 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-2025-71399 actively exploited?
CVE-2025-71399 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 76.7% of all scored CVEs.
What is the CVSS score of CVE-2025-71399?
CVE-2025-71399 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2025-71399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-71399, 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

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