CVE-2026-54765

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Source
https://cve.org/CVERecord?id=CVE-2026-54765
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54765.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54765
Aliases
Downstream
Related
Published
2026-07-06T20:27:32.803Z
Modified
2026-08-18T14:55:55.441127007Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N CVSS Calculator
Summary
Traefik: Gateway HTTPRoute backendRef filters can leak backend context across routes sharing a Service:port
Details

Traefik is an open source HTTP reverse proxy and load balancer. From v3.7.0 prior to v3.7.6, Traefik's Kubernetes Gateway API provider may resolve two accepted HTTPRoutes that target the same backend Service:port but configure different backendRef filters to the same child service and apply only one route's filter set to all requests reaching that backend. In Gateway deployments where backendRef filters set security-sensitive headers, such as tenant identity, authorization context, or values the backend trusts, an attacker who can create an accepted HTTPRoute sharing the same backend Service:port may cause their route's filter context to be applied to another route's requests, potentially crossing namespace boundaries when a ReferenceGrant permits cross-namespace targeting. This issue is fixed in version v3.7.6.

Database specific 
{
    "cwe_ids": [
        "CWE-284",
        "CWE-863"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54765.json"
}
References

Affected packages

Git / github.com/traefik/traefik

Affected ranges

Type
GIT
Repo
https://github.com/traefik/traefik
Events
Introduced
04aa6bb4f9776f2ba87e5cd181d250e3610e6419
Fixed
1afefcd7149ff331fa73ef62fb3dd69e3ced37ba
Fixed
8aada7a7d52e4588a75386d8b86d270f6fe8d549
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "3.7.0"
        },
        {
            "fixed": "3.7.6"
        }
    ]
}

Affected versions

v3.*
v3.7.0
v3.7.1
v3.7.2
v3.7.3
v3.7.4
v3.7.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54765.json"