CVE-2026-85595

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

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

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-71018 (ENISA EUVD) · GHSA-4v96-rv7j-9wmr (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Traefik versions before v2.11.55 and versions v3.0.0 through v3.7.10 contain an authentication bypass vulnerability in the digestAuth middleware where unknown usernames receive an empty secret instead of rejection. Attackers can compute a valid digest response using the empty secret and arbitrary credentials to bypass authentication on any digestAuth-protected route without a valid username or password.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
45
EG Risk 45/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation2.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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.
EPSS PROB
2.5%
EPSS %ILE
84th
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
2.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade 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; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

September 4, 2026

Last Modified

October 8, 2026

Advisory Details (2)

Auto-updated Oct 30, 2026
🔬 Proof of concept available. Patch available. Sources: github.
Web page

Traefik before v2.11.55 Authentication Bypass via digestAuth | Advisories | VulnCheck

https://www.vulncheck.com/advisories/traefik-before-2.11.55-authentication-bypass-via-digestauth
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Complete authentication bypass in the `digestAuth` middleware · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-5w68-77r2-r64c

Vendor Advisories for CVE-2026-85595(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatdevspaces/traefik-rhel9:17924641772026-10-26redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 118× 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 100 of 332 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. None are among the latest 100 rows. The 232 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 2.5% · 84th percentile
  2. 2026-11-01 09:35 UTCEG score recompute
  3. 2026-11-01 09:35 UTCVendor advisory
  4. 2026-11-01 09:35 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-31 16:33 UTCEPSS rescoreEPSS 2.5% · 84th percentile
  6. 2026-10-31 08:10 UTCEG score recompute
  7. 2026-10-31 08:10 UTCVendor advisory
  8. 2026-10-31 08:10 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-30 16:35 UTCEPSS rescoreEPSS 2.5% · 84th percentile
  10. 2026-10-30 06:42 UTCEG score recompute
  11. 2026-10-30 06:42 UTCVendor advisory
  12. 2026-10-30 06:42 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-10-29 16:34 UTCEPSS rescoreEPSS 2.5% · 84th percentile
  14. 2026-10-29 05:16 UTCEG score recompute
  15. 2026-10-29 05:16 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-28 16:33 UTCEPSS rescoreEPSS 2.5% · 84th percentile
  17. 2026-10-28 03:51 UTCEG score recompute
  18. 2026-10-28 03:50 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-10-27 02:11 UTCEG score recompute
  21. 2026-10-27 02:10 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-10-25 20:41 UTCEG score recompute
  24. 2026-10-25 20:41 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
Show 75 more
  1. 2026-10-25 13:55 UTCEG score recompute
  2. 2026-10-24 19:16 UTCEG score recompute
  3. 2026-10-24 19:16 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-10-23 17:50 UTCEG score recompute
  6. 2026-10-23 17:50 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  8. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  9. 2026-10-22 16:24 UTCEG score recompute
  10. 2026-10-22 16:24 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  12. 2026-10-21 14:58 UTCEG score recompute
  13. 2026-10-21 14:57 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  15. 2026-10-20 13:31 UTCEG score recompute
  16. 2026-10-20 13:31 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-10-19 12:04 UTCEG score recompute
  19. 2026-10-19 12:04 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-18 10:14 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-10-18 03:05 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  23. 2026-10-17 08:45 UTCEG score recompute
  24. 2026-10-17 08:45 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  26. 2026-10-16 07:19 UTCEG score recompute
  27. 2026-10-16 07:19 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  28. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  29. 2026-10-15 05:53 UTCEG score recompute
  30. 2026-10-15 05:52 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  31. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  32. 2026-10-14 01:30 UTCEG score recompute
  33. 2026-10-14 01:29 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  34. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  35. 2026-10-12 21:41 UTCEG score recompute
  36. 2026-10-12 21:41 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  37. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  38. 2026-10-12 14:52 UTCEG score recompute
  39. 2026-10-12 05:13 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  40. 2026-10-11 19:17 UTCEG score recompute
  41. 2026-10-11 16:34 UTCEG score recompute
  42. 2026-10-11 13:51 UTCEG score recompute
  43. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  44. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  45. 2026-10-10 18:35 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-10-10 13:27 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  47. 2026-10-10 09:03 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-10-10 03:37 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-10-09 23:14 UTCEG score recompute
  50. 2026-10-09 23:14 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  51. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  52. 2026-10-09 05:38 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  53. 2026-10-09 01:16 UTCEG score recompute
  54. 2026-10-09 01:16 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  55. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  56. 2026-10-08 16:34 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-10-08 16:02 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-10-08 08:07 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-10-08 03:35 UTCEG score recompute
  60. 2026-10-08 03:35 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  61. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  62. 2026-10-07 23:13 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  63. 2026-10-07 10:23 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-10-07 05:53 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  65. 2026-10-07 01:31 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  66. 2026-10-06 21:09 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-10-06 16:38 UTCEG score recompute
  68. 2026-10-06 16:38 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  70. 2026-10-06 12:10 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-10-06 07:48 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  72. 2026-10-06 03:27 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-10-05 23:02 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-10-05 17:47 UTCEG score recompute
  75. 2026-10-05 17:47 UTCGHSA enrichmentGHSA-4v96-rv7j-9wmr · GitHub severity CRITICAL · GitHub CVSS 9.8

Public detection templates

(1 reference)

A public Nuclei detection template is referenced for this CVE. A detection template checks whether a system is affected; it is not necessarily exploit code.

  • Nucleihttp/cves/2026/CVE-2026-85595.yaml
    Recorded Oct 28, 2026

    Traefik < 2.11.55 / 3.0.0 - 3.7.10 - Digest Authentication Bypass

    Open source ↗

Frequently asked(5)

What is CVE-2026-85595?
CVE-2026-85595 is a critical-severity vulnerability; its CVE record was published on September 4, 2026. Traefik versions before v2.11.55 and versions v3.0.0 through v3.7.10 contain an authentication bypass vulnerability in the digestAuth middleware where unknown usernames receive an empty secret instead of rejection. Attackers can compute a valid digest response using the empty secret and arbitrary…
When was CVE-2026-85595 made public?
CVE-2026-85595 was made public on August 21, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 4, 2026. EchelonGraph's copy of the record carries a last-modified date of October 8, 2026; the record at its source may have been updated since.
Is CVE-2026-85595 actively exploited?
CVE-2026-85595 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.5% probability of exploitation in the next 30 days (84th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-85595?
CVE-2026-85595 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-85595?
A fix for CVE-2026-85595 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-85595 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-85595

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