CVE-2026-32305

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 66% 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 are vulnerable to mTLS bypass through the TLS SNI pre-sniffing logic related to fragmented ClientHello packets. When a TLS ClientHello is fragmented across multiple records, Traefik's SNI extraction may fail with an EOF and return an empty SNI. The TCP router then falls back to the default TLS configuration, which does not require client certificates by default. This allows an attacker to bypass route-level mTLS enforcement and access services that should require mutual TLS authentication. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

Published

March 20, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 15, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_release.
github_release Patch Available

v3.7.0-ea.2

Patch available: traefik/traefik v3.7.0-ea.2 (pre-release)

https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2
github_release Patch Available

v3.6.11

Patch available: traefik/traefik v3.6.11

https://github.com/traefik/traefik/releases/tag/v3.6.11
github_release Patch Available

v2.11.41

Patch available: traefik/traefik v2.11.41

https://github.com/traefik/traefik/releases/tag/v2.11.41
github Patch Available🟡 PoC Available

Potential mTLS Bypass via Fragmented TLS ClientHello Causing Pre-SNI Sniff Fallback to Default Non-mTLS TLS Config · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-wvvq-wgcr-9q48

Vendor Advisories for CVE-2026-32305(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatdevspaces/traefik-rhel9:17797867792026-05-28redhat
redhatdevspaces/traefik-rhel9:17767185852026-04-23redhat

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 through 1.7.34: no fix on record
  • every version on: no fix on record
—
github.com/traefik/traefik/v2—
  • every version up to 2.11.41: fixed in 2.11.41
—
github.com/traefik/traefik/v3—
  • 3.7.0-ea.1 up to 3.7.0-ea.2: fixed in 3.7.0-ea.2
  • every version up to 3.6.11: fixed in 3.6.11
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 25× 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 129 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-32305?
CVE-2026-32305 is a medium vulnerability published on March 20, 2026. Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 are vulnerable to mTLS bypass through the TLS SNI pre-sniffing logic related to fragmented ClientHello packets. When a TLS ClientHello is fragmented across multiple records,…
When was CVE-2026-32305 disclosed?
CVE-2026-32305 was first published on March 20, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-32305 actively exploited?
CVE-2026-32305 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-32305?
CVE-2026-32305 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-32305?
A fix for CVE-2026-32305 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-32305 are linked in the Vendor Advisories panel on this page.

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