Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.44, 3.6.15, and 3.7.0-rc.3, there is an information disclosure vulnerability in Traefik's errors (custom error pages) middleware. When the backend returns a response matching the configured status range, the middleware forwards the original request's complete header set, including Authorization, Cookie, and other authentication material, to the separate error page service rather than only the minimal context needed to render the error page. This behavior is undocumented: the documentation states only that Host is forwarded by default, so operators are not warned that sensitive credentials are shared across service boundaries. Deployments using the errors middleware with a distinct error page service may inadvertently expose end-user credentials to infrastructure that was not intended to receive them. This vulnerability is fixed in 2.11.44, 3.6.15, and 3.7.0-rc.3.
CVE-2026-41181
“—” beside the score: it is equal to NVD's CVSS score.
This medium-severity CVE scores 5.8 under NVD CVSS v3. EPSS exploit probability: 0.4% (38th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-30557 (ENISA EUVD) · GHSA-p6hg-qh38-555r (GitHub Security Advisories) · GO-2026-5532 (OSV.dev)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 5.8
- EG Score
- 5.8MEDIUMmedium confidence
- EG Risk
- 41EG Risk 41/100
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)Severity58% × 45%Impact severity (EG Severity): CVSS 5.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.4% × 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 partial (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
- 0.4%
- EPSS %ILE
- 38th
- 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 (5.8): severity, escalated by confirmed exploitation. This CVE's 5.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.4% 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days 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; 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 partial (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; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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
May 15, 2026
Last Modified
May 19, 2026
Advisory Details (4)
Auto-updated May 15, 2026Errors middleware forwards Authorization and Cookie headers to separate error page service · Advisory · traefik/traefik · GitHub
https://github.com/traefik/traefik/security/advisories/GHSA-p6hg-qh38-555rRelease v3.7.0-rc.3 · traefik/traefik · GitHub
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.3Release v3.6.15 · traefik/traefik · GitHub
https://github.com/traefik/traefik/releases/tag/v3.6.15Release v2.11.44 · traefik/traefik · GitHub
https://github.com/traefik/traefik/releases/tag/v2.11.44Vendor Advisories for CVE-2026-41181(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(3)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| go | github.com/traefik/traefik/v2 @ 2.11.44 (fixes <= 2.11.43) | — | ghsa |
| go | github.com/traefik/traefik/v3 @ 3.6.15 (fixes <= 3.6.14) | — | ghsa |
| go | github.com/traefik/traefik/v3 @ 3.7.0-rc.3 (fixes >= 3.7.0-rc.0, <= 3.7.0-rc.2) | — | ghsa |
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(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 40× 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 208 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 108 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-11-01 07:51 UTCGHSA enrichmentGHSA-p6hg-qh38-555r · GitHub severity MODERATE
- 2026-11-01 07:51 UTCEG score recompute
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-10-30 18:25 UTCOSV refresh
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-10-25 14:30 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-23 02:23 UTCEG score recompute
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-18 03:42 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
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- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-12 16:08 UTCEG score recompute
- 2026-10-11 19:51 UTCEG score recompute
- 2026-10-11 17:04 UTCEG score recompute
- 2026-10-11 14:30 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-30 04:28 UTCOSV refresh
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 38th percentile
- 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-11 07:23 UTCOSV refresh
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-23 17:28 UTCEG score recompute
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-22 01:32 UTCEG score recompute
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-20 19:24 UTCEG score recompute
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-17 10:16 UTCEG score recompute
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-16 03:49 UTCEG score recompute
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-14 02:19 UTCEG score recompute
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-12 21:24 UTCEG score recompute
- 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-11 23:04 UTCEG score recompute
- 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-11 00:48 UTCEG score recompute
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-10 00:02 UTCEG score recompute
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-09 01:46 UTCEG score recompute
- 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-07 18:04 UTCEG score recompute
- 2026-08-06 19:47 UTCEG score recompute
- 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
- 2026-08-05 21:31 UTCEG score recompute
Related CVEs(same product + same CWE)
Same product
10 shownGo:github.com/traefik/traefik/v3
Frequently asked(5)
What is CVE-2026-41181?
When was the CVE record for CVE-2026-41181 published?
Is CVE-2026-41181 actively exploited?
What is the CVSS score of CVE-2026-41181?
How do I remediate CVE-2026-41181?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-41181
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