CVE-2025-71399

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM 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: 0.5%CVSS: 8.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.6HIGHmedium confidence
EG Risk
54
EG Risk 54/100CISA SSVC

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%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 2, 2026

Last Modified

September 29, 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 rangeFix by version rangeDependents
better-auth—
  • every version up to 1.4.5: fixed in 1.4.5
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 93× 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 225 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

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 on August 2, 2026, with the most recent update on September 29, 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 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-71399?
CVE-2025-71399 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2025-71399?
A fix for CVE-2025-71399 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-71399 are linked in the Vendor Advisories panel on this page.

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