{"id":"EM-20261109-PHTK","url":"https://cyber.eventmonitor.net/incident/EM-20261109-PHTK/aiohttp-vulnerability-cve-2026-123817/","type":"cve","title":"AIOHTTP Vulnerability (CVE-2026-123817)","subtitle":"CVE-2026-123817","subject":"CVE-2026-123817","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-09T22:18:38.273Z","firstSignal":"2026-11-09T21:17:58.000Z","lastSignal":"2026-11-09T22:18:38.273Z","updated":"2026-11-11T00:41:04.905Z","revision":1,"life":[{"status":"Born","at":"2026-11-09T22:18:38.273Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-11-09T22:18:38.273Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-09T21:17:58.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-09T22:18:38.273Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261109-PHTK created."}],"stages":[{"name":"Disclosed","at":"2026-11-09T22:18:38.273Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-09T22:18:38.273Z","detail":"CVSS 8.7 · EPSS 0.3%"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-09T21:17:58.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-09T21:17:58.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":3,"title":"Red Hat: CVE-2026-123817 (important)","text":"aiohttp: aiohttp: Denial of Service via memory exhaustion during WebSocket frame reassembly","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-123817.json"},{"at":"2026-11-09T22:18:38.273Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-123817 (CVSS 8.7)","text":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the WebSocket reader retains one bytes object for each transport read while reassembling an incomplete frame. A malicious peer can split a frame into many tiny reads so per-object overhead substantially exceeds the payload bytes allowed by max_msg_size. The condition affects a server receiving frames from a malicious client and a client receiving frames from a malicious server, and can cause excessive memory consumption or denial of service. This issue is fixed in version 3.14.4.","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123817"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-09T22:18:38.273","score":8.7,"severity":"HIGH","desc":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the WebSocket reader retains one bytes object for each transport read while reassembling an incomplete frame. A malicious peer can split a frame into many tiny reads so per-object overhead…","product":"","seen":1794273221013},"kev":null,"epss":{"epss":0.00328,"pct":0.26109,"at":1794357664905},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}