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CVE-2026-54761

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.21 and 3.7.5, there is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple (WRR) backendRefs, Traefik evaluates the allowlist against the target backendRef.namespace instead of the route's own namespace. As a result, an HTTPRoute created in a namespace that is not allow-listed can reference a cross-provider TraefikService s
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6412dd0280983562d573cd88ca54c5c115ca96a74740fa6369e891acb4060ea4
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-284","description":"CWE-284: Improper Access Control","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /containers/cna/problemTypes/0/descriptions/0

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

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"traefik","vendor":"traefik","versions":[{"status":"affected","version":"< 3.6.21"},{"status":"affected","version":">= 3.7.0-ea.1, < 3.7.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-284","description":"CWE-284: Improper Access Control","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/traefik/traefik/releases/tag/v3.6.21","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.6.21"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /containers/cna/references/1
{"name":"https://github.com/traefik/traefik/releases/tag/v3.7.5","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.7.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /containers/cna/references/2
{"name":"https://github.com/traefik/traefik/security/advisories/GHSA-3g6v-2r68-prfc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-3g6v-2r68-prfc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a6df5f10a046305ffb4c1e7fe54735e17d98a9b99143b602ccfd1bd9d5a584a0 · sha256:da661f6f53f54e21… · /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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