CVE-2025-55702

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{"bugzilla": {"description": "trafficserver: Apache Traffic Server: HTTP request smuggling via unread POST request body", "id": "2558464", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558464"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["When a client sends a POST with Expect: 100-continue and the origin answers before reading the body, Apache Traffic Server parses the unread body left on the client connection as the next request. An attacker behind a front-end proxy that shares connections to Traffic Server can use this to smuggle requests past the front end and desynchronize responses for other users.\nThis issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.\nUsers are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.", "A flaw was found in Apache Traffic Server. When a client sends a POST request with an Expect header and the origin server responds before consuming the full body, Traffic Server incorrectly parses the remaining unread body as a subsequent request. A remote attacker behind a front-end proxy sharing connections can exploit this issue to perform HTTP request smuggling, enabling them to bypass front-end security boundaries and access or tamper with responses intended for other users."], "name": "CVE-2025-55702", "public_date": "2026-10-21T18:24:21Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-55702\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-55702\nhttps://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"], "statement": "This vulnerability is rated as having an Important severity because successful exploitation permits an unauthenticated remote attacker to compromise the integrity and confidentiality of web traffic across multiplexed connections without requiring prior privileges. In shared proxy environments, desynchronization between upstream servers and intermediate caching layers can enable arbitrary request pipelining and cross-user data interception. Apache Traffic Server is not included in core Red Hat Enterprise Linux distributions and is only shipped via Fedora and Extra Packages for Enterprise Linux (EPEL).", "threat_severity": "Important"}

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