CVE-2026-54763

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 87% 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
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 10.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

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
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

Published

July 6, 2026

Last Modified

July 8, 2026

Advisory Details (3)

Auto-updated Oct 8, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github.
githubMentions a patch (unverified)🟡 PoC Available

Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth · Advisory · traefik/traefik · GitHub

Affected: v2.11.42 / v3.6.12 / v3.7.0-ea.3) added

https://github.com/traefik/traefik/security/advisories/GHSA-x677-9fxg-v5c5
github_pr

Add an option to remove request headers with underscores

Fix merged in traefik/traefik PR #13262 on 2026-06-19 — awaiting tagged release

https://github.com/traefik/traefik/pull/13262
github_commit

commit 108a5264473a (traefik/traefik)

Fix landed in traefik/traefik commit 108a5264473a — awaiting tagged release

https://github.com/traefik/traefik/commit/108a5264473a2cbc8f12d6d691a3c6553cdf2c1b

Vendor Advisories for CVE-2026-54763(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-rhel9:17877567992026-09-01redhat

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)
PackageVulnerable rangeFix by version rangeDependents
github.com/traefik/traefik—
  • every version on: no fix on record
—
github.com/traefik/traefik/v2—
  • every version up to 2.11.51: fixed in 2.11.51
—
github.com/traefik/traefik/v3—
  • every version up to 3.6.22: fixed in 3.6.22
  • 3.7.0 up to 3.7.6: fixed in 3.7.6
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 7× 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.

Showing the most recent 100 of 158 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-54763?
CVE-2026-54763 is a critical vulnerability published on July 6, 2026. Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which…
When was CVE-2026-54763 disclosed?
CVE-2026-54763 was first published on July 6, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54763 actively exploited?
CVE-2026-54763 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54763?
CVE-2026-54763 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-54763?
A fix for CVE-2026-54763 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54763 are linked in the Vendor Advisories panel on this page.

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