CVE-2026-32305 (GCVE-0-2026-32305)

Vulnerability from cvelistv5 – Published: 2026-03-20 10:01 – Updated: 2026-06-30 12:07
VLAI
Title
Traefik mTLS bypass via fragmented ClientHello SNI extraction failure
Summary
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.
Severity
7.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
8.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-287 - Improper Authentication
  • CWE-1188 - Insecure Default Initialization of Resource
  • CWE-179 - Incorrect Behavior Order: Early Validation
Assigner
References
Impacted products
Vendor Product Version
traefik traefik Affected: < 2.11.41
Affected: >= 3.0.0-beta1, < 3.6.11
Affected: >= 3.7.0-ea.1, < 3.7.0-ea.2
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Red Hat Red Hat OpenShift Dev Spaces 3.27     cpe:/a:redhat:openshift_devspaces:3.27::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.28     cpe:/a:redhat:openshift_devspaces:3.28::el9
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Red Hat Red Hat OpenShift GitOps     cpe:/a:redhat:openshift_gitops:1
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-32305\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-20T13:44:56.647317Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-20T13:44:59.946Z\"}}], \"cna\": {\"title\": \"Traefik mTLS bypass via fragmented ClientHello SNI extraction failure\", \"source\": {\"advisory\": \"GHSA-wvvq-wgcr-9q48\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 7.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"HIGH\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"traefik\", \"product\": \"traefik\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 2.11.41\"}, {\"status\": \"affected\", \"version\": \"\u003e= 3.0.0-beta1, \u003c 3.6.11\"}, {\"status\": \"affected\", \"version\": \"\u003e= 3.7.0-ea.1, \u003c 3.7.0-ea.2\"}]}], \"references\": [{\"url\": \"https://github.com/traefik/traefik/security/advisories/GHSA-wvvq-wgcr-9q48\", \"name\": \"https://github.com/traefik/traefik/security/advisories/GHSA-wvvq-wgcr-9q48\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/traefik/traefik/releases/tag/v2.11.41\", \"name\": \"https://github.com/traefik/traefik/releases/tag/v2.11.41\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/traefik/traefik/releases/tag/v3.6.11\", \"name\": \"https://github.com/traefik/traefik/releases/tag/v3.6.11\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2\", \"name\": \"https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\u0027s 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-287\", \"description\": \"CWE-287: Improper Authentication\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1188\", \"description\": \"CWE-1188: Insecure Default Initialization of Resource\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-03-20T10:01:13.620Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-32305\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-20T13:45:04.503Z\", \"dateReserved\": \"2026-03-11T21:16:21.659Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-03-20T10:01:13.620Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.