CVE-2026-41181

MEDIUMNVD 5.85.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 64% 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
5.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.8Exploit: NoneExposed: 0

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

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.

CVSS v3
5.8
EG Score
5.8(medium)
EPSS
35.9%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 19, 2026

Advisory Details (4)

Auto-updated May 15, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Errors middleware forwards Authorization and Cookie headers to separate error page service · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-p6hg-qh38-555r
generic

Release v3.7.0-rc.3 · traefik/traefik · GitHub

https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.3
generic

Release v3.6.15 · traefik/traefik · GitHub

https://github.com/traefik/traefik/releases/tag/v3.6.15
generic

Release v2.11.44 · traefik/traefik · GitHub

https://github.com/traefik/traefik/releases/tag/v2.11.44

Vendor 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.

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/traefik/traefik/v2—2.11.44—
github.com/traefik/traefik/v3—3.7.0-rc.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 44× 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. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
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  15. 2026-06-28 14:07 UTCEPSS rescore
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-27 21:54 UTCEG score recompute
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  19. 2026-06-26 20:12 UTCEG score recompute
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  21. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-22 14:25 UTCEPSS rescore
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  5. 2026-06-19 19:25 UTCEPSS rescore
  6. 2026-06-18 17:52 UTCEPSS rescore
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  8. 2026-06-17 20:16 UTCEG score recompute
  9. 2026-06-17 17:53 UTCEPSS rescore
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  16. 2026-06-13 23:00 UTCEPSS rescore
  17. 2026-06-12 23:12 UTCEPSS rescore
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  19. 2026-06-12 12:53 UTCEG score recompute
  20. 2026-06-11 14:37 UTCEG score recompute
  21. 2026-06-11 14:00 UTCEPSS rescore
  22. 2026-06-10 22:18 UTCEPSS rescore
  23. 2026-06-10 16:20 UTCEG score recompute
  24. 2026-06-10 13:22 UTCEPSS rescore
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  26. 2026-06-09 18:04 UTCEG score recompute
  27. 2026-06-08 19:47 UTCEG score recompute
  28. 2026-06-08 14:17 UTCEPSS rescore
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  30. 2026-06-07 17:30 UTCEG score recompute
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  37. 2026-06-05 20:58 UTCEG score recompute
  38. 2026-06-05 06:10 UTCEPSS rescore
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  40. 2026-06-04 22:41 UTCEG score recompute
  41. 2026-06-04 13:12 UTCEPSS rescore
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  43. 2026-06-04 00:24 UTCEG score recompute
  44. 2026-06-03 02:07 UTCEG score recompute
  45. 2026-06-02 20:13 UTCEPSS rescore
  46. 2026-06-02 03:50 UTCEG score recompute
  47. 2026-06-01 13:52 UTCEPSS rescore
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  50. 2026-06-01 05:33 UTCEG score recompute
  51. 2026-05-31 22:30 UTCEPSS rescore
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  56. 2026-05-29 13:44 UTCEPSS rescore
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  64. 2026-05-26 13:44 UTCEPSS rescore
  65. 2026-05-26 07:18 UTCEPSS rescore
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  67. 2026-05-23 00:07 UTCEG score recompute
  68. 2026-05-20 22:38 UTCEPSS rescore
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  71. 2026-05-20 11:22 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-41181?
CVE-2026-41181 is a medium vulnerability published on May 15, 2026. 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…
When was CVE-2026-41181 disclosed?
CVE-2026-41181 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41181 actively exploited?
CVE-2026-41181 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41181?
CVE-2026-41181 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2026-41181?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41181, 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

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