CVE-2026-85594

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-04. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its Service, and if that middleware injects backend credentials, recover them at a controlled backend.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware | Advisories | VulnCheck

https://www.vulncheck.com/advisories/traefik-3.7.1-crossprovidernamespaces-bypass-via-service-middleware
github Patch Available🟡 PoC Available

Kubernetes Ingress service middleware bypasses crossProviderNamespaces · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-m6wx-622r-48r9

Vendor Advisories for CVE-2026-85594(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 43× in last 7d / 80× 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. 2026-09-20 03:08 UTCGHSA enrichment
  2. 2026-09-19 22:56 UTCGHSA enrichment
  3. 2026-09-19 18:44 UTCEG score recompute
  4. 2026-09-19 18:44 UTCGHSA enrichment
  5. 2026-09-19 14:32 UTCGHSA enrichment
  6. 2026-09-19 10:14 UTCGHSA enrichment
  7. 2026-09-19 06:02 UTCGHSA enrichment
  8. 2026-09-19 01:48 UTCGHSA enrichment
  9. 2026-09-18 21:36 UTCEG score recompute
  10. 2026-09-18 21:36 UTCGHSA enrichment
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-18 17:24 UTCGHSA enrichment
  13. 2026-09-18 13:12 UTCGHSA enrichment
  14. 2026-09-18 09:00 UTCGHSA enrichment
  15. 2026-09-18 04:48 UTCGHSA enrichment
  16. 2026-09-18 00:36 UTCGHSA enrichment
  17. 2026-09-17 20:24 UTCEG score recompute
  18. 2026-09-17 20:24 UTCGHSA enrichment
  19. 2026-09-17 19:32 UTCEPSS rescore
  20. 2026-09-17 13:58 UTCGHSA enrichment
  21. 2026-09-17 09:46 UTCGHSA enrichment
  22. 2026-09-17 05:34 UTCGHSA enrichment
  23. 2026-09-17 01:22 UTCEG score recompute
  24. 2026-09-17 01:22 UTCGHSA enrichment
  25. 2026-09-16 21:10 UTCEG score recompute▲ 2.80
Show 55 more
  1. 2026-09-16 21:10 UTCGHSA enrichment
  2. 2026-09-16 20:45 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  3. 2026-09-16 20:14 UTCEG score recompute
  4. 2026-09-16 20:14 UTCGHSA enrichment
  5. 2026-09-16 14:09 UTCEPSS rescore
  6. 2026-09-16 09:01 UTCEG score recompute
  7. 2026-09-16 09:01 UTCGHSA enrichment
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 20:52 UTCGHSA enrichment
  10. 2026-09-15 09:28 UTCEG score recompute
  11. 2026-09-15 09:28 UTCGHSA enrichment
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-14 22:15 UTCGHSA enrichment
  15. 2026-09-14 11:02 UTCGHSA enrichment
  16. 2026-09-13 23:49 UTCEG score recompute
  17. 2026-09-13 23:49 UTCGHSA enrichment
  18. 2026-09-13 12:37 UTCGHSA enrichment
  19. 2026-09-13 01:22 UTCEG score recompute
  20. 2026-09-13 01:22 UTCGHSA enrichment
  21. 2026-09-12 14:09 UTCGHSA enrichment
  22. 2026-09-12 02:56 UTCGHSA enrichment
  23. 2026-09-11 15:43 UTCEG score recompute
  24. 2026-09-11 15:43 UTCGHSA enrichment
  25. 2026-09-11 14:53 UTCEPSS rescore
  26. 2026-09-11 14:53 UTCEPSS rescore
  27. 2026-09-11 04:30 UTCGHSA enrichment
  28. 2026-09-10 17:17 UTCEG score recompute
  29. 2026-09-10 17:16 UTCGHSA enrichment
  30. 2026-09-10 06:01 UTCGHSA enrichment
  31. 2026-09-09 18:44 UTCGHSA enrichment
  32. 2026-09-09 07:31 UTCEG score recompute
  33. 2026-09-09 07:31 UTCGHSA enrichment
  34. 2026-09-08 22:01 UTCEPSS rescore
  35. 2026-09-08 20:18 UTCGHSA enrichment
  36. 2026-09-08 16:09 UTCEG score recompute
  37. 2026-09-08 16:08 UTCGHSA enrichment
  38. 2026-09-08 15:16 UTCEG score recompute
  39. 2026-09-08 15:16 UTCGHSA enrichment
  40. 2026-09-08 06:13 UTCGHSA enrichment
  41. 2026-09-07 18:58 UTCEG score recompute
  42. 2026-09-07 18:58 UTCGHSA enrichment
  43. 2026-09-07 07:45 UTCGHSA enrichment
  44. 2026-09-06 20:28 UTCEG score recompute
  45. 2026-09-06 20:28 UTCGHSA enrichment
  46. 2026-09-06 13:48 UTCEPSS rescore
  47. 2026-09-06 09:15 UTCGHSA enrichment
  48. 2026-09-05 22:01 UTCEG score recompute
  49. 2026-09-05 22:00 UTCGHSA enrichment
  50. 2026-09-05 15:31 UTCEPSS rescore
  51. 2026-09-05 10:48 UTCGHSA enrichment
  52. 2026-09-04 23:34 UTCGHSA enrichment
  53. 2026-09-04 12:21 UTCEG score recompute
  54. 2026-09-04 11:34 UTCEG score recompute
  55. 2026-09-04 11:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85594?
CVE-2026-85594 is a critical vulnerability published on September 4, 2026. Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its…
When was CVE-2026-85594 disclosed?
CVE-2026-85594 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85594 actively exploited?
CVE-2026-85594 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 81.6% of all scored CVEs.
What is the CVSS score of CVE-2026-85594?
CVE-2026-85594 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-85594?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85594, 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

Explore the affected products and dependency analysis for CVE-2026-85594

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