CVE-2026-88012

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{"bugzilla": {"description": "traefik: Traefik: Denial of Service via slow HTTP/3 request bodies", "id": "2531519", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531519"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 entrypoints do not apply entryPoints..transport.respondingTimeouts.readTimeout because the timeout is enforced on a TCP connection and the HTTP/3 server has no corresponding QUIC stream deadline. An unauthenticated client can use a slow request body, trickling data indefinitely while holding a request and an upstream connection open and exhausting backends with bounded connection pools. This issue is fixed in 2.11.56 and 3.7.12.", "A flaw was found in Traefik, an open-source HTTP reverse proxy and load balancer. Its HTTP/3 entrypoints do not correctly apply read timeouts, which are intended to prevent prolonged connections. An unauthenticated client can exploit this by sending a slow request body, continuously trickling data. This allows the client to hold open a request and an upstream connection indefinitely, potentially exhausting backend connection pools and leading to a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Disable HTTP/3 on Traefik entrypoints handling client traffic, or enforce strict request timeout controls at the upstream server/backend level until updated packages are deployed."}, "name": "CVE-2026-88012", "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": "2026-09-10T15:35:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88012\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88012\nhttps://github.com/traefik/traefik/commit/a8d0bc425859dde7481a6c9a324e610b81d754d0\nhttps://github.com/traefik/traefik/pull/13717\nhttps://github.com/traefik/traefik/releases/tag/v2.11.56\nhttps://github.com/traefik/traefik/releases/tag/v3.7.12\nhttps://github.com/traefik/traefik/security/advisories/GHSA-7ghq-v6jf-g56c"], "statement": "A flaw in Traefik's HTTP/3 implementation allows unauthenticated remote attackers to cause a denial of service against upstream services. Traefik fails to enforce read timeouts (respondingTimeouts.readTimeout) on HTTP/3 entrypoints due to missing QUIC stream deadline enforcement. An attacker can transmit slow request bodies to hold HTTP/3 connections open indefinitely, consuming available proxy resources and exhausting backend connection pools under default operational limits.", "threat_severity": "Important"}

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