{"id":"CVE-2026-111064","kind":"vulnerability","aliases":["CVE-2026-111064","GHSA-5wr8-gcqf-gqf3"],"related":[],"title":"aiohttp server lacks an initial request/header timeout","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, keepalive timeout handling is absent during the initial portion of a request. An attacker can keep an idle connection open indefinitely before sending any request data, consuming server connection capacity. This issue is fixed in version 3.14.4.","summary":"aiohttp's server did not apply its keepalive timeout to the start of a new request, so a client could hold an idle connection open indefinitely without sending data. An attacker can tie up server connections and exhaust resources by opening many such connections.","severity":"high","cvss":8.2,"epss":0.0039900001138448715,"exploited":false,"exploited_at":null,"products":[{"name":"aiohttp","fixed":["3.14.4"],"affected":"<= 3.14.3","ecosystem":"pypi"}],"ecosystems":["pypi"],"tags":["aiohttp","cwe-770","package","python","self-hosted"],"not_affected_if":["behind-reverse-proxy-with-timeouts","version-3.14.4-or-later"],"how_to_check":"pip show aiohttp (or check the lockfile) and look for a version at or below 3.14.3\nSource says the server is affected when running aiohttp directly, which is the default for an aiohttp web app without a reverse proxy in front","fix":"Upgrade aiohttp to 3.14.4 or later.\nUntil upgraded, put a reverse proxy with sensible keepalive and header timeouts in front of the app.","status":"open","published_at":"2026-10-19T17:08:04+00:00","first_seen_at":"2026-10-23T19:11:32+00:00","triaged_at":"2026-10-23T20:15:33+00:00","updated_at":"2026-10-23T21:57:18+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-10-23T20:15:33Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade aiohttp to 3.14.4 or later.\nUntil upgraded, put a reverse proxy with sensible keepalive and header timeouts in front of the app.","summary":"aiohttp's server did not apply its keepalive timeout to the start of a new request, so a client could hold an idle connection open indefinitely without sending data. An attacker can tie up server connections and exhaust resources by opening many such connections.","category":"package","who_cares":["python","aiohttp","self-hosted"],"confidence":0.8,"analyst_note":"","how_to_check":"pip show aiohttp (or check the lockfile) and look for a version at or below 3.14.3\nSource says the server is affected when running aiohttp directly, which is the default for an aiohttp web app without a reverse proxy in front\nunknown","needs_analyst":false,"not_affected_if":["version-3.14.4-or-later","behind-reverse-proxy-with-timeouts"],"severity_if_unknown":"high"},"cost_usd":0.000375,"input_tokens":2046,"output_tokens":341,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-111064':10A,18A '-2026':9A,17A '-770':22B '3.14.4':85C,122C '5wr8':13A 'absent':90C 'aiohttp':1A,19A,20B,28B,72C 'appli':33B 'asynchron':75C 'asyncio':80C 'attack':58B,99C 'capac':115C 'client':46B 'client/server':77C 'connect':51B,63B,71B,104C,114C 'consum':112C 'could':47B 'cve':8A,16A 'cwe':21B 'data':56B,111C 'exhaust':65B 'fix':119C 'framework':78C 'gcqf':14A 'ghsa':12A 'ghsa-5wr8-gcqf-gqf3':11A 'gqf3':15A 'handl':88C 'hold':48B 'host':27B 'http':76C 'idl':50B,103C 'indefinit':53B,106C 'initi':5A,93C 'issu':117C 'keep':101C 'keepal':35B,86C 'lack':3A 'mani':69B 'new':42B 'open':52B,68B,105C 'packag':23B 'portion':94C 'prior':83C 'python':24B,82C 'request':43B,97C,110C 'request/header':6A 'resourc':66B 'self':26B 'self-host':25B 'send':55B,108C 'server':2A,30B,62B,113C 'start':39B 'tie':60B 'timeout':7A,36B,87C 'version':121C 'without':54B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-19T17:08:04+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"ghsa","external_id":"GHSA-5wr8-gcqf-gqf3","url":"https://github.com/advisories/GHSA-5wr8-gcqf-gqf3","severity":"high","published_at":"2026-10-19T17:08:04+00:00","modified_at":"2026-10-19T17:08:05+00:00","first_seen_at":"2026-10-23T19:11:32+00:00","fetched_at":"2026-10-23T19:11:32+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-111064","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111064","severity":null,"published_at":"2026-10-19T17:17:03+00:00","modified_at":"2026-10-19T20:55:02+00:00","first_seen_at":"2026-10-23T21:57:18+00:00","fetched_at":"2026-10-23T22:28:57+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}