CVE-2026-85695

CRITICALPre-NVD 9.49.4—
EchelonGraph scoreHIGH confidence

Score 9.4 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-04. a secondary CVSS source baseline 9.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.4Exploit: None knownExposed: 0

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

FastChat contains an authentication bypass vulnerability in the /register_worker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victim model names to intercept user prompts, images, and responses, or probe internal network ports across the worker mesh.

CVSS v3
9.4
EG Score
9.4(high)
EG Risk
57(Track)
EG Risk 57/100SSVC: 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
Severity94% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 10, 2026

Advisory Details (4)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

FastChat Unauthenticated Worker Registration SSRF and Model Spoofing | Advisories | VulnCheck

https://www.vulncheck.com/advisories/fastchat-unauthenticated-worker-registration-ssrf-and-model-spoofing
generic

Unauthenticated SSRF and worker/model spoofing via the controller /register_worker endpoint · Issue #3886 · lm-sys/FastChat · GitHub

https://github.com/lm-sys/FastChat/issues/3886
generic

FastChat/fastchat/serve/controller.py at v0.2.36 · lm-sys/FastChat · GitHub

https://github.com/lm-sys/FastChat/blob/v0.2.36/fastchat/serve/controller.py
generic

GitHub - lm-sys/FastChat: An open platform for training, serving, and evaluating large language models. Release repo for Vicuna and Chatbot Arena. · GitHub

https://github.com/lm-sys/FastChat

Vendor Advisories for CVE-2026-85695(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 52× in last 7d / 122× 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 122 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85695?
CVE-2026-85695 is a critical vulnerability published on September 4, 2026. FastChat contains an authentication bypass vulnerability in the /register_worker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victim model names to intercept user…
When was CVE-2026-85695 disclosed?
CVE-2026-85695 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85695 actively exploited?
CVE-2026-85695 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 64.8% of all scored CVEs.
What is the CVSS score of CVE-2026-85695?
CVE-2026-85695 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-85695?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85695, 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.

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