CVE-2025-61686

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-01-08. A secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-1468 (ENISA EUVD) · GHSA-9583-h5hc-x8cw (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 17%CVSS: 9.1Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

React Router is a router for React. In @react-router/node versions 7.0.0 through 7.9.3, @remix-run/deno prior to version 2.17.2, and @remix-run/node prior to version 2.17.2, if createFileSessionStorage() is being used from @react-router/node (or @remix-run/node/@remix-run/deno in Remix v2) with an unsigned cookie, it is possible for an attacker to cause the session to try to read/write from a location outside the specified session file directory. The success of the attack would depend on the permissions of the web server process to access those files. Read files cannot be returned directly to the attacker. Session file reads would only succeed if the file matched the expected session file format. If the file matched the session file format, the data would be populated into the server side session but not directly returned to the attacker unless the application logic returned specific session information. This issue has been patched in @react-router/node version 7.9.4, @remix-run/deno version 2.17.2, and @remix-run/node version 2.17.2.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
72
EG Risk 72/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
17%
EPSS %ILE
97th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
17% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

January 10, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
Patch available. Sources: github, redhat.
Red Hat

2428423 – (CVE-2025-61686) CVE-2025-61686 react-router: React Router has Path Traversal in File Session Storage

https://bugzilla.redhat.com/show_bug.cgi?id=2428423
Red HatMentions a patch (unverified)

CVE-2025-61686 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2025-61686
GitHub advisoryMentions a patch (unverified)

Unauthorized file access when using `createFileSessionStorage()` with unsigned cookies · Advisory · remix-run/react-router · GitHub

https://github.com/remix-run/react-router/security/advisories/GHSA-9583-h5hc-x8cw

Vendor Advisories for CVE-2025-61686(1)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
npm@react-router/node @ 7.9.4 (fixes >= 7.0.0, <= 7.9.3)—ghsa
npm@remix-run/deno @ 2.17.2 (fixes <= 2.17.1)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 1 ecosystem)
npm(3)
PackageVulnerable rangeFix by version rangeDependents
@react-router/node—
  • 7.0.0 up to 7.9.4: fixed in 7.9.4
—
@remix-run/deno—
  • every version up to 2.17.2: fixed in 2.17.2
—
@remix-run/node—
  • every version up to 2.17.2: fixed in 2.17.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 57× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 212 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 114 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 05:41 UTCEG score recompute
  2. 2026-11-02 05:41 UTCGHSA enrichmentGHSA-9583-h5hc-x8cw · GitHub severity CRITICAL · GitHub CVSS 9.1
  3. 2026-11-01 16:33 UTCEPSS rescoreEPSS 17% · 97th percentile
  4. 2026-11-01 08:02 UTCGHSA enrichmentGHSA-9583-h5hc-x8cw · GitHub severity CRITICAL · GitHub CVSS 9.1
  5. 2026-11-01 08:02 UTCEG score recompute
  6. 2026-11-01 05:28 UTCEG score recompute
  7. 2026-10-31 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  8. 2026-10-31 05:15 UTCEG score recompute
  9. 2026-10-30 16:33 UTCEPSS rescoreEPSS 17% · 97th percentile
  10. 2026-10-30 05:03 UTCEG score recompute
  11. 2026-10-29 16:32 UTCEPSS rescoreEPSS 17% · 97th percentile
  12. 2026-10-29 04:50 UTCEG score recompute
  13. 2026-10-28 16:30 UTCEPSS rescoreEPSS 17% · 97th percentile
  14. 2026-10-28 04:36 UTCEG score recompute
  15. 2026-10-27 16:30 UTCEPSS rescoreEPSS 17% · 97th percentile
  16. 2026-10-27 04:23 UTCEG score recompute
  17. 2026-10-26 16:30 UTCEPSS rescoreEPSS 17% · 97th percentile
  18. 2026-10-25 23:45 UTCEG score recompute
  19. 2026-10-25 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  20. 2026-10-25 16:14 UTCEG score recompute
  21. 2026-10-24 23:19 UTCEG score recompute
  22. 2026-10-24 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  23. 2026-10-23 23:06 UTCEG score recompute
  24. 2026-10-23 16:30 UTCEPSS rescoreEPSS 17% · 97th percentile
  25. 2026-10-22 22:52 UTCEG score recompute
Show 73 more
  1. 2026-10-22 16:33 UTCEPSS rescoreEPSS 17% · 97th percentile
  2. 2026-10-21 22:37 UTCEG score recompute
  3. 2026-10-21 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  4. 2026-10-20 22:24 UTCEG score recompute
  5. 2026-10-20 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  6. 2026-10-19 22:05 UTCEG score recompute
  7. 2026-10-19 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  8. 2026-10-18 20:53 UTCEG score recompute
  9. 2026-10-18 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  10. 2026-10-18 05:22 UTCEG score recompute
  11. 2026-10-17 20:30 UTCEG score recompute
  12. 2026-10-17 16:33 UTCEPSS rescoreEPSS 17% · 97th percentile
  13. 2026-10-16 20:17 UTCEG score recompute
  14. 2026-10-16 16:39 UTCEPSS rescoreEPSS 17% · 97th percentile
  15. 2026-10-15 17:43 UTCEG score recompute
  16. 2026-10-15 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  17. 2026-10-14 16:31 UTCEPSS rescoreEPSS 17% · 97th percentile
  18. 2026-10-14 11:36 UTCEG score recompute
  19. 2026-10-13 16:33 UTCEPSS rescoreEPSS 17% · 97th percentile
  20. 2026-10-12 16:52 UTCEG score recompute
  21. 2026-10-12 16:33 UTCEPSS rescoreEPSS 17% · 97th percentile
  22. 2026-10-11 20:26 UTCEG score recompute
  23. 2026-10-11 18:38 UTCEG score recompute
  24. 2026-10-11 15:13 UTCEG score recompute
  25. 2026-10-11 13:47 UTCEPSS rescoreEPSS 17% · 97th percentile
  26. 2026-10-10 19:59 UTCEPSS rescoreEPSS 17% · 97th percentile
  27. 2026-10-09 20:06 UTCEPSS rescoreEPSS 17% · 97th percentile
  28. 2026-10-09 11:25 UTCOSV refresh
  29. 2026-10-08 17:10 UTCEPSS rescoreEPSS 17% · 97th percentile
  30. 2026-10-07 23:47 UTCEPSS rescoreEPSS 17% · 97th percentile
  31. 2026-10-06 15:17 UTCEPSS rescoreEPSS 17% · 97th percentile
  32. 2026-10-05 17:42 UTCEPSS rescoreEPSS 18% · 97th percentile
  33. 2026-10-03 14:25 UTCEPSS rescoreEPSS 18% · 97th percentile
  34. 2026-10-01 19:49 UTCEPSS rescoreEPSS 18% · 97th percentile
  35. 2026-09-30 15:02 UTCEPSS rescoreEPSS 18% · 97th percentile
  36. 2026-09-29 15:20 UTCEPSS rescoreEPSS 18% · 97th percentile
  37. 2026-09-28 13:50 UTCEPSS rescoreEPSS 18% · 97th percentile
  38. 2026-09-26 15:58 UTCEPSS rescoreEPSS 18% · 97th percentile
  39. 2026-09-24 14:02 UTCEPSS rescoreEPSS 18% · 97th percentile
  40. 2026-09-23 13:47 UTCEPSS rescoreEPSS 18% · 97th percentile
  41. 2026-09-20 20:15 UTCEPSS rescoreEPSS 18% · 97th percentile
  42. 2026-09-19 18:30 UTCOSV refresh
  43. 2026-09-19 15:42 UTCEPSS rescoreEPSS 18% · 97th percentile
  44. 2026-09-18 19:27 UTCEPSS rescoreEPSS 18% · 96th percentile
  45. 2026-09-17 19:30 UTCEPSS rescoreEPSS 18% · 96th percentile
  46. 2026-09-16 14:07 UTCEPSS rescoreEPSS 18% · 96th percentile
  47. 2026-09-15 03:10 UTCEPSS rescoreEPSS 18% · 96th percentile
  48. 2026-09-12 15:00 UTCEPSS rescoreEPSS 18% · 96th percentile
  49. 2026-09-11 14:52 UTCEPSS rescoreEPSS 18% · 96th percentile
  50. 2026-09-11 09:36 UTCEPSS rescoreEPSS 18% · 96th percentile
  51. 2026-09-10 09:34 UTCEPSS rescoreEPSS 18% · 96th percentile
  52. 2026-09-08 22:00 UTCEPSS rescoreEPSS 18% · 96th percentile
  53. 2026-09-07 16:00 UTCEPSS rescoreEPSS 18% · 96th percentile
  54. 2026-09-06 13:47 UTCEPSS rescoreEPSS 17% · 96th percentile
  55. 2026-09-04 05:06 UTCEPSS rescoreEPSS 17% · 96th percentile
  56. 2026-09-02 14:11 UTCEPSS rescoreEPSS 17% · 96th percentile
  57. 2026-09-01 13:53 UTCEPSS rescoreEPSS 17% · 96th percentile
  58. 2026-08-31 21:34 UTCOSV refresh
  59. 2026-08-30 19:16 UTCEPSS rescoreEPSS 17% · 96th percentile
  60. 2026-08-30 01:21 UTCEPSS rescoreEPSS 17% · 96th percentile
  61. 2026-08-28 21:40 UTCEPSS rescoreEPSS 16% · 96th percentile
  62. 2026-08-27 14:24 UTCEPSS rescoreEPSS 16% · 96th percentile
  63. 2026-08-26 14:45 UTCEPSS rescoreEPSS 16% · 96th percentile
  64. 2026-08-25 13:48 UTCEPSS rescoreEPSS 16% · 96th percentile
  65. 2026-08-24 14:16 UTCEPSS rescoreEPSS 16% · 96th percentile
  66. 2026-08-23 00:18 UTCEPSS rescoreEPSS 16% · 96th percentile
  67. 2026-08-21 23:48 UTCEPSS rescoreEPSS 16% · 96th percentile
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  72. 2026-08-16 14:55 UTCEPSS rescoreEPSS 16% · 96th percentile
  73. 2026-08-16 02:13 UTCEPSS rescoreEPSS 16% · 96th percentile

Frequently asked(5)

What is CVE-2025-61686?
CVE-2025-61686 is a critical-severity vulnerability; its CVE record was published on January 10, 2026. React Router is a router for React. In @react-router/node versions 7.0.0 through 7.9.3, @remix-run/deno prior to version 2.17.2, and @remix-run/node prior to version 2.17.2, if createFileSessionStorage() is being used from @react-router/node (or @remix-run/node/@remix-run/deno in Remix v2) with an…
When was the CVE record for CVE-2025-61686 published?
The CVE record for CVE-2025-61686 was published on January 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 15, 2026; the record at its source may have been updated since.
Is CVE-2025-61686 actively exploited?
CVE-2025-61686 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-61686?
CVE-2025-61686 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2025-61686?
A fix for CVE-2025-61686 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-61686 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-61686

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