{"id":"CVE-2024-52303","aliases":["DEBIAN-CVE-2024-52303","EUVD-2024-3176","GHSA-27mf-ghqm-j3j8","PYSEC-2026-1096","UBUNTU-CVE-2024-52303","openSUSE-SU-2024:14556-1"],"status":"published","title":"aiohttp memory leak when middleware is enabled when requesting a resource with a non-allowed method","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions starting with 3.10.6 and prior to 3.10.11, a memory leak can occur when a request produces a MatchInfoError. This was caused by adding an entry to a cache on each request, due to the building of each MatchInfoError producing a unique cache entry. An attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests. Those who use any middlewares with aiohttp.web should upgrade to version 3.10.11 to receive a patch.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00591,"percentile":0.48607,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-772"],"published":"2024-11-18T20:08:15Z","modified":"2026-11-02T12:02:55Z","fixes":[{"ecosystem":"PyPI","package":"aiohttp","fixed_in":["3.10.11"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:13","package":"python-aiohttp","fixed_in":["3.10.11-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"python-aiohttp","fixed_in":["3.10.11-1"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"python-aiohttp","fixed_in":["3.11.9-1.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"aiohttp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10.6"},{"fixed":"3.10.11"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"python-aiohttp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.10.11-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"python-aiohttp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.10.11-1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"aiohttp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10.6"},{"fixed":"3.10.11"}]}],"versions":["3.10.10","3.10.11rc0","3.10.6","3.10.7","3.10.8","3.10.9"]},{"source":"osv","ecosystem":"PyPI","package":"aiohttp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10.6"},{"fixed":"3.10.11"}]}],"versions":["3.10.10","3.10.11rc0","3.10.6","3.10.7","3.10.8","3.10.9"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-aiohttp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.11.9-1.1"}]}]}],"products":[{"vendor":"aio-libs","product":"aiohttp"},{"vendor":"aiohttp","product":"aio-libs"},{"vendor":"aiohttp","product":"aiohttp"}],"references":[{"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-27mf-ghqm-j3j8","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/aio-libs/aiohttp/commit/bc15db61615079d1b6327ba42c682f758fa96936","tags":["x_refsource_MISC","Patch","fix","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-52303","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-27mf-ghqm-j3j8","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/52xxx/CVE-2024-52303.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2024-52303","tags":["advisory"]},{"url":"https://github.com/aio-libs/aiohttp","tags":["package"]},{"url":"https://pypi.org/project/aiohttp","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2024-52303","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2024-52303","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2024-52303","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2024-52303","title":"aiohttp memory leak when middleware is enabled when requesting a resource with a non-allowed method","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions starting with 3.10.6 and prior to 3.10.11, a memory leak can occur when a request produces a MatchInfoError. This was caused by adding an entry to a cache on each request, due to the building of each MatchInfoError producing a unique cache entry. An attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests. Those who use any middlewares with aiohttp.web should upgrade to version 3.10.11 to receive a patch.","status":"published","published":"2024-11-18T20:08:15.387Z","modified":"2024-11-19T14:45:27.044Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:34:03.333404Z"}],"euvd":[{"id":"EUVD-2024-3176","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions starting with 3.10.6 and prior to 3.10.11, a memory leak can occur when a request produces a MatchInfoError. This was caused by adding an entry to a cache on each request, due to the building of each MatchInfoError producing a unique cache entry. An attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests. Those who use any middlewares with aiohttp.web should upgrade to version 3.10.11 to receive a patch.","status":"published","published":"2024-11-18T20:08:15Z","modified":"2024-11-19T14:45:27Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-03T00:04:56.531722Z"}],"ghsa":[{"id":"GHSA-27mf-ghqm-j3j8","title":"aiohttp has a memory leak when middleware is enabled when requesting a resource with a non-allowed method","description":"### Summary\n\nA memory leak can occur when a request produces a `MatchInfoError`. This was caused by adding an entry to a cache on each request, due to the building of each `MatchInfoError` producing a unique cache entry.\n\n### Impact\n\nIf the user is making use of any middlewares with `aiohttp.web` then it is advisable to upgrade immediately.\n\nAn attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/bc15db61615079d1b6327ba42c682f758fa96936","status":"published","published":"2024-11-18T21:02:17Z","modified":"2024-11-19T20:48:53Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:38:21.777721Z"}],"nvd":[{"id":"CVE-2024-52303","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions starting with 3.10.6 and prior to 3.10.11, a memory leak can occur when a request produces a MatchInfoError. This was caused by adding an entry to a cache on each request, due to the building of each MatchInfoError producing a unique cache entry. An attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests. Those who use any middlewares with aiohttp.web should upgrade to version 3.10.11 to receive a patch.","status":"published","published":"2024-11-18T20:15:06.047Z","modified":"2026-06-17T08:06:58.483Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/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","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:10:37.632431Z"}],"osv":[{"id":"CVE-2024-52303","title":"aiohttp memory leak when middleware is enabled when requesting a resource with a non-allowed method","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions starting with 3.10.6 and prior to 3.10.11, a memory leak can occur when a request produces a MatchInfoError. This was caused by adding an entry to a cache on each request, due to the building of each MatchInfoError producing a unique cache entry. An attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests. Those who use any middlewares with aiohttp.web should upgrade to version 3.10.11 to receive a patch.","status":"published","published":"2024-11-18T20:08:15.387Z","modified":"2026-10-28T02:30:55.242738575Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T15:44:44.032344Z"},{"id":"DEBIAN-CVE-2024-52303","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions starting with 3.10.6 and prior to 3.10.11, a memory leak can occur when a request produces a MatchInfoError. This was caused by adding an entry to a cache on each request, due to the building of each MatchInfoError producing a unique cache entry. An attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests. Those who use any middlewares with aiohttp.web should upgrade to version 3.10.11 to receive a patch.","status":"published","published":"2024-11-18T20:15:06.047Z","modified":"2026-11-02T12:02:55.922097779Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/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","level":"high"}],"updated_at":"2026-11-02T15:45:44.117337Z"},{"id":"GHSA-27mf-ghqm-j3j8","title":"aiohttp has a memory leak when middleware is enabled when requesting a resource with a non-allowed method","description":"### Summary\n\nA memory leak can occur when a request produces a `MatchInfoError`. This was caused by adding an entry to a cache on each request, due to the building of each `MatchInfoError` producing a unique cache entry.\n\n### Impact\n\nIf the user is making use of any middlewares with `aiohttp.web` then it is advisable to upgrade immediately.\n\nAn attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/bc15db61615079d1b6327ba42c682f758fa96936","status":"published","published":"2024-11-18T21:02:17Z","modified":"2026-09-10T03:50:20.38249714Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T15:46:33.956911Z"},{"id":"PYSEC-2026-1096","title":"aiohttp has a memory leak when middleware is enabled when requesting a resource with a non-allowed method","description":"### Summary\n\nA memory leak can occur when a request produces a `MatchInfoError`. This was caused by adding an entry to a cache on each request, due to the building of each `MatchInfoError` producing a unique cache entry.\n\n### Impact\n\nIf the user is making use of any middlewares with `aiohttp.web` then it is advisable to upgrade immediately.\n\nAn attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/bc15db61615079d1b6327ba42c682f758fa96936","status":"published","published":"2026-07-07T14:34:45.010533Z","modified":"2026-07-07T17:46:18.681380663Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T15:52:54.622769Z"},{"id":"UBUNTU-CVE-2024-52303","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In versions starting with 3.10.6 and prior to 3.10.11, a memory leak can occur when a request produces a MatchInfoError. This was caused by adding an entry to a cache on each request, due to the building of each MatchInfoError producing a unique cache entry. An attacker may be able to exhaust the memory resources of a server by sending a substantial number (100,000s to millions) of such requests. Those who use any middlewares with aiohttp.web should upgrade to version 3.10.11 to receive a patch.","status":"withdrawn","published":"2024-11-18T20:15:00Z","modified":"2025-07-17T17:15:52Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:55:11.182485Z"},{"id":"openSUSE-SU-2024:14556-1","title":"python310-aiohttp-3.11.9-1.1 on GA media","description":"These are all security issues fixed in the python310-aiohttp-3.11.9-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-12-06T00:00:00Z","modified":"2026-02-04T02:13:48.791712Z","updated_at":"2026-11-02T16:58:36.976155Z"}]}}