CVE-2026-53622

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 52% 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
Trending — 3 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 10.0Exploit: None knownExposed: 0

A fix is available — apply it.

Traefik is an HTTP reverse proxy and load balancer. Versions prior to 3.7.3, 3.6.18, and 2.11.51 have a critical vulnerability in Traefik's HTTP/3 (QUIC) TLS configuration selection that allows unauthenticated clients to bypass router-specific mTLS enforcement. When HTTP/3 is enabled on an entrypoint, the TLS handshake selects the applicable TLS configuration through an exact, case-sensitive lookup on the SNI value, which fails to match wildcard host patterns (e.g., *.example.com) or case variants of the configured hostname. Because the handshake falls back to the default TLS configuration — which may not require client certificates — a client can complete the QUIC handshake without presenting a certificate, while the subsequent HTTP routing layer still dispatches the request to a backend protected by a router-specific mTLS policy. The issue affects deployments where HTTP/3 is enabled, a router uses a wildcard Host rule or case-insensitive hostname matching, a router-specific TLSOptions enforces client certificate authentication, and UDP access to the entrypoint is reachable by an attacker. This vulnerability is fixed in versions 3.7.3, 3.6.18, and 2.11.51.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

June 16, 2026

Last Modified

September 2, 2026

Advisory Details (9)

Auto-updated Sep 16, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, redhat.
redhat Patch Available

CVE-2026-53622 - 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-2026-53622
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:62260
redhat Patch Available
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53622.json
github Patch Available🟡 PoC Available

HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case hosts · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-9cr8-q42q-g8m7
github_release Patch Available

v3.7.3

Patch available: traefik/traefik v3.7.3

https://github.com/traefik/traefik/releases/tag/v3.7.3
github_pr

Move snicheck to ctx instead of simulated routing

Fix merged in traefik/traefik PR #13214 on 2026-05-28 — awaiting tagged release

https://github.com/traefik/traefik/pull/13214
generic

Comparing v3.6.17...v3.6.18 · traefik/traefik · GitHub

https://github.com/traefik/traefik/compare/v3.6.17...v3.6.18
generic

New Security Update for Traefik 2.11 (2.11.48), 3.6 (3.6.19) and 3.7 (3.7.3) - Announcements - Traefik Labs Community Forum

https://community.traefik.io/t/new-security-update-for-traefik-2-11-2-11-48-3-6-3-6-19-and-3-7-3-7-3/29917
redhat

2491924 – (CVE-2026-53622) CVE-2026-53622 github.com/traefik/traefik: Traefik: mTLS enforcement bypass due to HTTP/3 TLS configuration flaw

https://bugzilla.redhat.com/show_bug.cgi?id=2491924

Vendor Advisories for CVE-2026-53622(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 / EcosystemFixed in / 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

(4 across 1 ecosystem)
Go(4)
PackageVulnerable rangeFixed inDependents
github.com/traefik/traefik———
github.com/traefik/traefik/v2—2.11.51—
github.com/traefik/traefik/v3—3.7.3—
Traefik—3.7.3—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 33× 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 132 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-16 14:08 UTCEPSS rescore
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-14 07:30 UTCVendor advisory
  5. 2026-09-14 03:28 UTCEG score recompute
  6. 2026-09-14 03:28 UTCVendor advisory
  7. 2026-09-13 16:47 UTCEPSS rescore
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-10 09:35 UTCEPSS rescore
  10. 2026-09-08 22:01 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-02 14:12 UTCEPSS rescore
  15. 2026-09-02 13:37 UTCVendor advisory
  16. 2026-09-02 12:37 UTCVendor advisory
  17. 2026-09-01 21:24 UTCEG score recompute
  18. 2026-09-01 13:54 UTCEPSS rescore
  19. 2026-09-01 04:40 UTCEPSS rescore
  20. 2026-08-30 22:42 UTCEG score recompute
  21. 2026-08-30 19:17 UTCEPSS rescore
  22. 2026-08-30 01:22 UTCEPSS rescore
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  24. 2026-08-27 14:25 UTCEPSS rescore
  25. 2026-08-26 14:46 UTCEPSS rescore
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  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 23:22 UTCEG score recompute
  3. 2026-08-23 09:19 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 01:07 UTCEG score recompute
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-20 08:32 UTCEG score recompute
  9. 2026-08-19 17:04 UTCEPSS rescore
  10. 2026-08-19 08:43 UTCEG score recompute
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-17 14:26 UTCEG score recompute
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-16 21:56 UTCEG score recompute
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  16. 2026-08-16 02:24 UTCEG score recompute
  17. 2026-08-16 02:14 UTCEPSS rescore
  18. 2026-08-15 04:15 UTCEG score recompute
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 00:13 UTCEG score recompute
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-12 15:42 UTCEG score recompute
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-11 15:19 UTCEG score recompute
  25. 2026-08-11 03:19 UTCEG score recompute
  26. 2026-08-11 00:00 UTCEPSS rescore
  27. 2026-08-09 15:53 UTCEG score recompute
  28. 2026-08-09 13:46 UTCEPSS rescore
  29. 2026-08-08 19:54 UTCEG score recompute
  30. 2026-08-08 16:37 UTCEPSS rescore
  31. 2026-08-07 19:54 UTCEG score recompute
  32. 2026-08-06 15:14 UTCEG score recompute
  33. 2026-08-06 13:47 UTCEPSS rescore
  34. 2026-08-05 23:14 UTCEG score recompute
  35. 2026-08-05 19:17 UTCEPSS rescore
  36. 2026-08-04 15:35 UTCEG score recompute
  37. 2026-08-04 15:10 UTCEPSS rescore
  38. 2026-08-04 10:39 UTCEPSS rescore
  39. 2026-08-02 04:30 UTCEG score recompute
  40. 2026-08-02 02:27 UTCEPSS rescore
  41. 2026-08-01 08:16 UTCEG score recompute
  42. 2026-08-01 04:16 UTCEPSS rescore
  43. 2026-07-30 23:15 UTCEG score recompute
  44. 2026-07-30 16:28 UTCEPSS rescore
  45. 2026-07-30 09:20 UTCEG score recompute
  46. 2026-07-30 04:08 UTCEG score recompute
  47. 2026-07-30 01:30 UTCEPSS rescore
  48. 2026-07-29 03:00 UTCEG score recompute
  49. 2026-07-28 15:37 UTCEPSS rescore
  50. 2026-07-27 18:16 UTCEG score recompute
  51. 2026-07-26 19:45 UTCEG score recompute
  52. 2026-07-26 14:54 UTCEPSS rescore
  53. 2026-07-25 14:18 UTCEPSS rescore
  54. 2026-07-24 14:18 UTCEPSS rescore
  55. 2026-07-23 14:18 UTCEPSS rescore
  56. 2026-07-23 03:19 UTCEG score recompute
  57. 2026-07-22 14:08 UTCEPSS rescore
  58. 2026-07-21 15:25 UTCEPSS rescore
  59. 2026-07-20 17:08 UTCEPSS rescore
  60. 2026-07-19 14:31 UTCEPSS rescore
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  62. 2026-07-19 02:29 UTCEPSS rescore
  63. 2026-07-18 10:04 UTCEPSS rescore
  64. 2026-07-16 17:03 UTCEPSS rescore
  65. 2026-07-15 16:57 UTCEPSS rescore
  66. 2026-07-15 16:57 UTCEPSS rescore
  67. 2026-07-15 07:00 UTCEG score recompute▲ 0.90
  68. 2026-07-15 02:00 UTCEPSS rescore
  69. 2026-07-15 02:00 UTCEPSS rescore
  70. 2026-07-15 01:24 UTCNVD updateCVSS v3 → 10
  71. 2026-07-15 01:14 UTCEG score recompute▼ 0.90
  72. 2026-07-15 00:50 UTCMITRE cvelistV5CVSS v3 → 9.1
  73. 2026-07-13 22:31 UTCEPSS rescore
  74. 2026-07-13 06:13 UTCEPSS rescore
  75. 2026-07-13 06:13 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-53622?
CVE-2026-53622 is a critical vulnerability published on June 16, 2026. Traefik is an HTTP reverse proxy and load balancer. Versions prior to 3.7.3, 3.6.18, and 2.11.51 have a critical vulnerability in Traefik's HTTP/3 (QUIC) TLS configuration selection that allows unauthenticated clients to bypass router-specific mTLS enforcement. When HTTP/3 is enabled on an…
When was CVE-2026-53622 disclosed?
CVE-2026-53622 was first published in the National Vulnerability Database on June 16, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53622 actively exploited?
CVE-2026-53622 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.3% of all scored CVEs.
What is the CVSS score of CVE-2026-53622?
CVE-2026-53622 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-53622?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53622, 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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