Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
CVE-2026-35051
“—” beside the score: it is equal to NVD's CVSS score.
This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.3% (22nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 10.0
- EG Score
- 10.0CRITICALmedium confidence
- EG Risk
- 60EG Risk 60/100
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)Severity100% × 45%Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.3% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.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 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 at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.3%
- EPSS %ILE
- 22nd
- 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 (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.
- EG Severity
- 10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). 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: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: 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 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)3 days if the affected system is publicly exposed; 60 days if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable yes (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
April 30, 2026
Last Modified
July 15, 2026
Advisory Details (8)
Auto-updated Oct 15, 20262464235 – (CVE-2026-35051) CVE-2026-35051 Traefik: github.com/traefik/traefik: Traefik: Authentication bypass in ForwardAuth middleware
https://bugzilla.redhat.com/show_bug.cgi?id=2464235CVE-2026-35051 - 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-2026-35051ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth · Advisory · traefik/traefik · GitHub
https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54v3.7.0-rc.2
Patch available: traefik/traefik v3.7.0-rc.2 (pre-release)
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2v3.6.14
Patch available: traefik/traefik v3.6.14
https://github.com/traefik/traefik/releases/tag/v3.6.14v2.11.43
Patch available: traefik/traefik v2.11.43
https://github.com/traefik/traefik/releases/tag/v2.11.43Vendor Advisories for CVE-2026-35051(1)
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 / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | devspaces/traefik-rhel9:1779786779 | 2026-05-28 | redhat |
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)
Go(3)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| github.com/traefik/traefik | — |
| — |
| github.com/traefik/traefik/v2 | — |
| — |
| github.com/traefik/traefik/v3 | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 21× in last 7d / 46× 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 99 of 328 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 229 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-20 05:58 UTCEG score recompute
- 2026-10-20 05:58 UTCVendor advisory
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-19 07:47 UTCEG score recompute
- 2026-10-19 07:47 UTCVendor advisory
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-18 09:30 UTCVendor advisory
- 2026-10-18 03:45 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-17 06:22 UTCEG score recompute
- 2026-10-17 06:22 UTCVendor advisory
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-16 07:41 UTCEG score recompute
- 2026-10-16 07:41 UTCVendor advisory
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-15 06:39 UTCEG score recompute
- 2026-10-15 06:39 UTCVendor advisory
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-14 02:18 UTCEG score recompute
- 2026-10-14 02:18 UTCVendor advisory
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-12 22:35 UTCEG score recompute
- 2026-10-12 22:35 UTCVendor advisory
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-12 16:12 UTCEG score recompute
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- 2026-10-12 08:17 UTCVendor advisory
- 2026-10-11 19:54 UTCEG score recompute
- 2026-10-11 17:07 UTCEG score recompute
- 2026-10-11 14:34 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-09-23 06:45 UTCOSV refresh
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-04 01:16 UTCOSV refresh
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-17 13:48 UTCEG score recompute
- 2026-08-17 13:48 UTCVendor advisory
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-16 09:34 UTCVendor advisory
- 2026-08-16 05:21 UTCEG score recompute
- 2026-08-16 05:21 UTCVendor advisory
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-15 01:10 UTCVendor advisory
- 2026-08-14 20:57 UTCVendor advisory
- 2026-08-14 16:44 UTCVendor advisory
- 2026-08-14 12:15 UTCVendor advisory
- 2026-08-14 08:02 UTCVendor advisory
- 2026-08-14 03:49 UTCEG score recompute
- 2026-08-14 03:49 UTCVendor advisory
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 18th percentile
- 2026-08-13 10:56 UTCVendor advisory
- 2026-08-13 06:43 UTCVendor advisory
- 2026-08-13 01:53 UTCVendor advisory
- 2026-08-12 21:40 UTCVendor advisory
- 2026-08-12 17:27 UTCEG score recompute
- 2026-08-12 17:27 UTCVendor advisory
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 18th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownGo:github.com/traefik/traefik/v3
Same vendor
10 shownredhat:RHSA-2026:21772
Frequently asked(5)
What is CVE-2026-35051?
When was the CVE record for CVE-2026-35051 published?
Is CVE-2026-35051 actively exploited?
What is the CVSS score of CVE-2026-35051?
How do I remediate CVE-2026-35051?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-35051
Is Your Infrastructure Affected by CVE-2026-35051?
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