CVE-2026-85597

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

Traefik before v2.11.55 and v3.0.0 through v3.7.10 contain a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate authentication by creating conflicting TLS options on multi-host routers. Attackers can reach protected backends by exploiting shared TLS resolution across multiple hostnames in a single router rule, causing the strict mTLS requirement to fall back to default options for all hosts.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 4, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Traefik before v2.11.55 mTLS Bypass via TLS Option Conflict | Advisories | VulnCheck

https://www.vulncheck.com/advisories/traefik-before-2.11.55-mtls-bypass-via-tls-option-conflict
github Patch Available🟡 PoC Available

TLS option confusion in multi-host routers can bypass mTLS for protected hosts · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-g55h-rg46-x9c5

Vendor Advisories for CVE-2026-85597(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 / 120× 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 120 total refreshes for this CVE.

  1. 2026-09-25 08:12 UTCGHSA enrichment
  2. 2026-09-25 04:10 UTCGHSA enrichment
  3. 2026-09-25 00:08 UTCGHSA enrichment
  4. 2026-09-24 20:05 UTCGHSA enrichment
  5. 2026-09-24 16:03 UTCEG score recompute
  6. 2026-09-24 16:03 UTCGHSA enrichment
  7. 2026-09-24 14:04 UTCEPSS rescore
  8. 2026-09-24 12:01 UTCGHSA enrichment
  9. 2026-09-24 07:58 UTCGHSA enrichment
  10. 2026-09-24 03:56 UTCGHSA enrichment
  11. 2026-09-23 23:53 UTCGHSA enrichment
  12. 2026-09-23 19:51 UTCEG score recompute
  13. 2026-09-23 19:51 UTCGHSA enrichment
  14. 2026-09-23 17:54 UTCEPSS rescore
  15. 2026-09-23 15:48 UTCGHSA enrichment
  16. 2026-09-23 11:46 UTCGHSA enrichment
  17. 2026-09-23 07:43 UTCGHSA enrichment
  18. 2026-09-23 03:40 UTCGHSA enrichment
  19. 2026-09-22 23:37 UTCGHSA enrichment
  20. 2026-09-22 19:24 UTCGHSA enrichment
  21. 2026-09-22 15:22 UTCGHSA enrichment
  22. 2026-09-22 11:19 UTCGHSA enrichment
  23. 2026-09-22 07:17 UTCGHSA enrichment
  24. 2026-09-22 03:15 UTCGHSA enrichment
  25. 2026-09-21 23:11 UTCEG score recompute
Show 75 more
  1. 2026-09-21 23:11 UTCGHSA enrichment
  2. 2026-09-21 21:09 UTCEPSS rescore
  3. 2026-09-21 19:09 UTCGHSA enrichment
  4. 2026-09-21 15:06 UTCGHSA enrichment
  5. 2026-09-21 10:40 UTCGHSA enrichment
  6. 2026-09-21 06:37 UTCGHSA enrichment
  7. 2026-09-21 02:35 UTCGHSA enrichment
  8. 2026-09-20 22:32 UTCEG score recompute
  9. 2026-09-20 22:32 UTCGHSA enrichment
  10. 2026-09-20 20:16 UTCEPSS rescore
  11. 2026-09-20 18:29 UTCGHSA enrichment
  12. 2026-09-20 14:26 UTCGHSA enrichment
  13. 2026-09-20 10:24 UTCGHSA enrichment
  14. 2026-09-20 06:21 UTCGHSA enrichment
  15. 2026-09-20 02:17 UTCGHSA enrichment
  16. 2026-09-19 22:15 UTCGHSA enrichment
  17. 2026-09-19 18:12 UTCEG score recompute
  18. 2026-09-19 18:12 UTCGHSA enrichment
  19. 2026-09-19 14:04 UTCGHSA enrichment
  20. 2026-09-19 09:55 UTCGHSA enrichment
  21. 2026-09-19 05:33 UTCGHSA enrichment
  22. 2026-09-19 01:30 UTCGHSA enrichment
  23. 2026-09-18 21:23 UTCEG score recompute
  24. 2026-09-18 21:23 UTCGHSA enrichment
  25. 2026-09-18 19:28 UTCEPSS rescore
  26. 2026-09-18 16:38 UTCGHSA enrichment
  27. 2026-09-18 12:35 UTCGHSA enrichment
  28. 2026-09-18 08:33 UTCGHSA enrichment
  29. 2026-09-18 04:29 UTCGHSA enrichment
  30. 2026-09-18 00:27 UTCGHSA enrichment
  31. 2026-09-17 20:24 UTCEG score recompute
  32. 2026-09-17 20:24 UTCGHSA enrichment
  33. 2026-09-17 19:32 UTCEPSS rescore
  34. 2026-09-17 13:19 UTCGHSA enrichment
  35. 2026-09-17 09:17 UTCGHSA enrichment
  36. 2026-09-17 05:15 UTCGHSA enrichment
  37. 2026-09-17 01:12 UTCGHSA enrichment
  38. 2026-09-16 21:10 UTCEG score recompute▲ 0.90
  39. 2026-09-16 21:10 UTCGHSA enrichment
  40. 2026-09-16 20:45 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  41. 2026-09-16 18:28 UTCEG score recompute
  42. 2026-09-16 18:28 UTCGHSA enrichment
  43. 2026-09-16 14:09 UTCEPSS rescore
  44. 2026-09-16 06:33 UTCEG score recompute
  45. 2026-09-16 06:32 UTCGHSA enrichment
  46. 2026-09-16 05:15 UTCEPSS rescore
  47. 2026-09-15 19:25 UTCGHSA enrichment
  48. 2026-09-15 08:18 UTCEG score recompute
  49. 2026-09-15 08:18 UTCGHSA enrichment
  50. 2026-09-15 03:12 UTCEPSS rescore
  51. 2026-09-15 03:12 UTCEPSS rescore
  52. 2026-09-14 21:11 UTCGHSA enrichment
  53. 2026-09-14 09:56 UTCGHSA enrichment
  54. 2026-09-13 22:36 UTCEG score recompute
  55. 2026-09-13 22:36 UTCGHSA enrichment
  56. 2026-09-13 11:29 UTCGHSA enrichment
  57. 2026-09-13 00:22 UTCEG score recompute
  58. 2026-09-13 00:22 UTCGHSA enrichment
  59. 2026-09-12 13:15 UTCGHSA enrichment
  60. 2026-09-12 02:08 UTCGHSA enrichment
  61. 2026-09-11 15:01 UTCEG score recompute
  62. 2026-09-11 15:01 UTCGHSA enrichment
  63. 2026-09-11 14:53 UTCEPSS rescore
  64. 2026-09-11 14:53 UTCEPSS rescore
  65. 2026-09-11 03:54 UTCGHSA enrichment
  66. 2026-09-10 16:47 UTCEG score recompute
  67. 2026-09-10 16:47 UTCGHSA enrichment
  68. 2026-09-10 05:40 UTCGHSA enrichment
  69. 2026-09-09 18:33 UTCGHSA enrichment
  70. 2026-09-09 07:25 UTCEG score recompute
  71. 2026-09-09 07:25 UTCGHSA enrichment
  72. 2026-09-08 22:01 UTCEPSS rescore
  73. 2026-09-08 20:18 UTCGHSA enrichment
  74. 2026-09-08 06:13 UTCGHSA enrichment
  75. 2026-09-07 19:03 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85597?
CVE-2026-85597 is a critical vulnerability published on September 4, 2026. Traefik before v2.11.55 and v3.0.0 through v3.7.10 contain a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate authentication by creating conflicting TLS options on multi-host routers. Attackers can reach protected backends by exploiting…
When was CVE-2026-85597 disclosed?
CVE-2026-85597 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-2026-85597 actively exploited?
CVE-2026-85597 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 74.0% of all scored CVEs.
What is the CVSS score of CVE-2026-85597?
CVE-2026-85597 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-85597?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85597, 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-2026-85597

Explore →

Is Your Infrastructure Affected by CVE-2026-85597?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs