CVE-2026-48491

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{"bugzilla": {"description": "Traefik: Traefik: Unauthorized access due to mutual TLS bypass", "id": "2491923", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491923"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-807", "details": ["A flaw was found in Traefik, an HTTP reverse proxy and load balancer. This vulnerability allows an unauthenticated client to bypass mutual Transport Layer Security (TLS) enforcement, a security measure that verifies both client and server identities. The bypass occurs due to an issue in Traefik's domain-fronting protection (SNICheck), which incorrectly processes TLS options for HTTP Host headers. As a result, an attacker can gain unauthorized access to protected backend services without presenting a required client certificate."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid configuring Traefik with wildcard host rules (e.g., Host(*.example.com)) alongside strict TLS options such as RequireAndVerifyClientCert on entrypoints that also serve permissive SNI configurations. Alternatively, restrict network access to Traefik's entrypoints to trusted networks only, thereby limiting potential exposure."}, "name": "CVE-2026-48491", "package_state": [{"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/traefik-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}], "public_date": "2026-06-23T19:12:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-48491\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-48491\nhttps://github.com/traefik/traefik/releases/tag/v3.7.3\nhttps://github.com/traefik/traefik/security/advisories/GHSA-5r4w-85f3-pw66"], "statement": "This is an Important flaw in Traefik that allows an unauthenticated client to bypass mutual TLS authentication. The vulnerability arises from an issue in Traefik's domain-fronting protection when specific wildcard host rules with strict TLS options are used alongside permissive SNI configurations on the same entrypoint. This bypass enables unauthorized access to protected backend services, undermining critical access controls.", "threat_severity": "Important"}

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