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CVE-2026-41174

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An act
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7286c03971798ece081bc658820da6e2c4d902db5448d2f853d4bdf208b65848
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-653","description":"CWE-653: Improper Isolation or Compartmentalization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"traefik","vendor":"traefik","versions":[{"status":"affected","version":"< 2.11.43"},{"status":"affected","version":">= 3.7.0-ea.1, < 3.7.0-rc.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":4.8,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-653","description":"CWE-653: Improper Isolation or Compartmentalization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/references/1
{"name":"https://github.com/traefik/traefik/releases/tag/v2.11.43","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v2.11.43"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/references/2
{"name":"https://github.com/traefik/traefik/releases/tag/v3.6.14","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.6.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/references/3
{"name":"https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/references/4
{"name":"https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:21828ddb52bfcb1af9c624bdcfd7d6f6f68b0bebd78f5c05b6bf49d44c47954d · sha256:c7aa3fa99711eaa6… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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