CVE-2026-85594

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Source
https://cve.org/CVERecord?id=CVE-2026-85594
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85594.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-85594
Aliases
  • GHSA-m6wx-622r-48r9
Downstream
CGA (4)
MINI (3)
Published
2026-09-04T11:29:58Z
Modified
2026-09-18T03:48:30Z
Severity
  • 7.0 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N CVSS Calculator
Summary
Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware
Details

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its Service, and if that middleware injects backend credentials, recover them at a controlled backend.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-639"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85594.json"
}
References

Affected packages

Git / github.com/traefik/traefik

Affected ranges

Type
GIT
Repo
https://github.com/traefik/traefik
Events
Introduced
fa49e2bcad7ffd8a80accdf1fae1ae480913d93d
Fixed
faa1eb590646aed94e561e24a59be0c47353ae95
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "3.7.1"
        },
        {
            "last_affected":  "3.7.12"
        },
        {
            "introduced":  "0"
        },
        {
            "fixed":  "3.7.11"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

v3.*
v3.7.1
v3.7.10
v3.7.2
v3.7.3
v3.7.4
v3.7.5
v3.7.6
v3.7.7
v3.7.8
v3.7.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85594.json"