{"schemaVersion":3,"id":"CVE-2026-111749","aliases":["DEBIAN-CVE-2026-111749","GHSA-gx76-c99x-2c96"],"status":"published","duplicateOf":null,"title":null,"description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Host-Only scope on an existing parent-domain cookie can be removed by a subdomain. A user who accesses an untrusted subdomain can consequently have host-only protections stripped from cookies, although impact is limited when applications do not reflect those cookies to a browser. This issue is fixed in version 3.14.4.","dates":{"published":"2026-10-19T17:04:42.374Z","modified":"2026-10-19T17:04:42.374Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":2.3,"severity":"low","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":2.3,"severity":"low","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":2.3,"severity":"low","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Pypi","score":2.3,"severity":"low","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true}]},"epss":{"probability":0.00294,"percentile":0.20678,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-20T00:00:00.000Z","score":0.00294,"percentile":0.20678}],"last30":[{"date":"2026-10-20T00:00:00.000Z","score":0.00294,"percentile":0.20678}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-565","name":"Reliance on Cookies without Validation and Integrity Checking","description":"The product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/565.html"}],"affected":[{"vendor":"aio-libs","product":"aiohttp","name":"aiohttp","label":"aiohttp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 3.14.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.14.4","eol":null,"hubHref":"/vendor/aio-libs/aiohttp"},{"vendor":"debian","product":"python-aiohttp","name":"python-aiohttp","label":"python-aiohttp","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/python-aiohttp","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"PyPI","product":"aiohttp","name":"aiohttp","label":"aiohttp","ecosystem":"PyPI","cpePart":null,"purl":"pkg:pypi/aiohttp","purlType":"pypi","versions":[{"text":"< 3.14.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.14.4","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96","label":"github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96","hostname":"github.com","tags":["X Refsource CONFIRM","WEB"]},{"url":"https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6","label":"github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4","label":"github.com/aio-libs/aiohttp/releases/tag/v3.14.4","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-111749","label":"security-tracker.debian.org/tracker/CVE-2026-111749","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111749","label":"nvd.nist.gov/vuln/detail/CVE-2026-111749","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/aio-libs/aiohttp","label":"github.com/aio-libs/aiohttp","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-19T17:04:42.374Z","label":"Published","detail":"Vulnerability first disclosed.","source":null}],"risk":{"score":9,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T03:02:06.919Z","stale":false,"partial":false}}