{"id":"CVE-2025-53643","aliases":["AZL-65252","AZL-65256","CLSA-2026-1773101685","CLSA-2026-1787906503","CLSA-2026-1788866911","CLSA-2026-1789379698","DEBIAN-CVE-2025-53643","EUVD-2025-21384","GHSA-9548-qrrj-x5pj","PYSEC-2026-1104","RHSA-2026:1249","RHSA-2026:1506","RHSA-2026:2760","ROOT-APP-PYPI-CVE-2025-53643","SUSE-SU-2025:03057-1","SUSE-SU-2025:03201-1","SUSE-SU-2026:20425-1","UBUNTU-CVE-2025-53643","openSUSE-SU-2026:20204-1"],"status":"published","title":"AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","severity":{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00355,"percentile":0.29464,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2025-07-14T19:33:31Z","modified":"2026-11-05T05:36:30Z","fixes":[{"ecosystem":"PyPI","package":"aiohttp","fixed_in":["3.12.14"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:PyPI","package":"aiohttp","fixed_in":["3.8.4.post9+tuxcare"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"python-aiohttp","fixed_in":["3.8.4-1+deb12u2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"python-aiohttp","fixed_in":["3.12.15-1"],"sources":["osv"]},{"ecosystem":"Root:PyPI","package":"aiohttp","fixed_in":["3.10.11+aikido.3","3.9.1+aikido.7","3.12.13+aikido.3","3.10.11+aikido.4","3.8.6+aikido.1","3.10.11+aikido.5","3.10.11+aikido.6","3.10.11+aikido.7","3.8.6+aikido.2","3.8.6+aikido.3","3.10.11+aikido.8","3.8.6+aikido.4","3.8.6+aikido.5","3.8.6+aikido.6","3.8.6+aikido.7","3.8.6+aikido.8","3.8.6+aikido.9","3.8.6+aikido.10","3.10.11+aikido.9","3.8.6+aikido.11","3.8.6+aikido.12","3.8.6+aikido.13","3.9.1+aikido.8","3.12.13+aikido.4","3.10.11+aikido.10","3.10.11+aikido.11","3.10.11+aikido.12","3.8.6+aikido.14","3.12.13+aikido.5","3.9.1+aikido.9","3.8.6+aikido.15"],"sources":["osv"]},{"ecosystem":"SUSE:Linux 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Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","status":"published","published":"2025-07-14T20:17:18.247Z","modified":"2025-07-15T19:50:40.717Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:32:49.180768Z"}],"euvd":[{"id":"EUVD-2025-21384","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","status":"published","published":"2025-07-14T20:17:18Z","modified":"2025-07-15T19:50:40Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low"}],"updated_at":"2026-11-02T20:32:07.830372Z"}],"ghsa":[{"id":"GHSA-9548-qrrj-x5pj","title":" AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections","description":"### Summary\nThe Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request.\n\n### Impact\nIf a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections.\n\n----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/e8d774f635dc6d1cd3174d0e38891da5de0e2b6a","status":"published","published":"2025-07-14T19:33:31Z","modified":"2025-07-15T00:34:45Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:38:49.837727Z"}],"nvd":[{"id":"CVE-2025-53643","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","status":"published","published":"2025-07-14T21:15:27.827Z","modified":"2026-06-17T09:38:37.71Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/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":"low","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:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:11:18.285862Z"}],"osv":[{"id":"CVE-2025-53643","title":"AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","status":"published","published":"2025-07-14T20:17:18.247Z","modified":"2026-10-28T02:30:45.402215307Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:44:50.45326Z"},{"id":"DEBIAN-CVE-2025-53643","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","status":"published","published":"2025-07-14T21:15:27.827Z","modified":"2026-11-01T00:00:06.177491263Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:47.378563Z"},{"id":"GHSA-9548-qrrj-x5pj","title":" AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections","description":"### Summary\nThe Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request.\n\n### Impact\nIf a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections.\n\n----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/e8d774f635dc6d1cd3174d0e38891da5de0e2b6a","status":"published","published":"2025-07-14T19:33:31Z","modified":"2026-09-10T03:50:26.231846188Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:46:43.123867Z"},{"id":"PYSEC-2026-1104","title":" AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections","description":"### Summary\nThe Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request.\n\n### Impact\nIf a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections.\n\n----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/e8d774f635dc6d1cd3174d0e38891da5de0e2b6a","status":"published","published":"2026-07-07T16:02:58.01777Z","modified":"2026-07-07T17:46:26.996029094Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low"}],"updated_at":"2026-11-02T15:52:54.622769Z"},{"id":"RHSA-2026:1249","title":"Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update","status":"published","published":"2026-04-10T10:04:57Z","modified":"2026-10-20T10:04:47Z","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"}],"updated_at":"2026-11-02T15:53:18.066978Z"},{"id":"RHSA-2026:1506","title":"Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update","status":"published","published":"2026-02-07T10:08:10Z","modified":"2026-10-20T10:04:59Z","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"}],"updated_at":"2026-11-02T15:53:18.520917Z"},{"id":"RHSA-2026:2760","title":"Red Hat Security Advisory: Satellite 6.18.3 Async Update","status":"published","published":"2026-02-17T10:12:34Z","modified":"2026-10-20T10:06:51Z","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"}],"updated_at":"2026-11-02T15:53:19.449341Z"},{"id":"ROOT-APP-PYPI-CVE-2025-53643","title":"CVE-2025-53643 in aiohttp - Patched by Root","description":"Root has patched CVE-2025-53643 in the aiohttp package for Root:PyPI. Multiple fixed versions available.","status":"published","published":"2026-10-26T12:44:26Z","modified":"2026-10-26T13:15:06.161153075Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:27.940619Z"},{"id":"UBUNTU-CVE-2025-53643","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","status":"published","published":"2025-07-14T21:15:00Z","modified":"2026-07-23T01:15:15.431264768Z","cvss":[{"version":"4.0","score":1.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U","level":"low"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:55:50.31802Z"},{"id":"AZL-65252","title":"CVE-2025-53643 affecting package python-aiohttp 3.6.2-3","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","status":"published","published":"2025-07-14T21:15:27Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:23.66471Z"},{"id":"AZL-65256","title":"CVE-2025-53643 affecting package python-aiohttp 3.6.2-3","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.","status":"published","published":"2025-07-14T21:15:27Z","modified":"2026-04-21T04:37:33.041165Z","updated_at":"2026-11-02T15:28:08.076947Z"},{"id":"CLSA-2026-1773101685","title":"TuxCare security update for aiohttp (2 CVEs)","description":"TuxCare rebuilt aiohttp to address 2 CVEs. Fixed in 3.8.1.post5+tuxcare.","status":"published","published":"2026-08-04T14:52:11Z","modified":"2026-10-15T09:48:05.155242407Z","updated_at":"2026-11-02T15:43:43.249928Z"},{"id":"CLSA-2026-1787906503","title":"TuxCare security update for aiohttp (8 CVEs)","description":"TuxCare rebuilt aiohttp to address 8 CVEs. Fixed in 3.8.6.post10+tuxcare.","status":"published","published":"2026-08-28T08:41:43Z","modified":"2026-10-22T14:31:00.003231976Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"CLSA-2026-1788866911","title":"TuxCare security update for aiohttp (6 CVEs)","description":"TuxCare rebuilt aiohttp to address 6 CVEs. Fixed in 3.8.5.post12+tuxcare.","status":"published","published":"2026-09-08T11:28:31Z","modified":"2026-10-15T09:48:01.437014779Z","updated_at":"2026-11-02T15:43:47.938828Z"},{"id":"CLSA-2026-1789379698","title":"TuxCare security update for aiohttp (1 CVE)","description":"TuxCare rebuilt aiohttp to address 1 CVE. Fixed in 3.8.4.post9+tuxcare.","status":"published","published":"2026-09-14T09:54:58Z","modified":"2026-10-15T09:48:01.715248601Z","updated_at":"2026-11-02T15:43:47.938828Z"},{"id":"openSUSE-SU-2026:20204-1","title":"Security update for python-aiohttp, python-Brotli","description":"This update for python-aiohttp, python-Brotli fixes the following issues:\n\nChanges in python-aiohttp:\n\n- CVE-2025-69228: Fixed denial of service through large payloads (bsc#1256022).\n- CVE-2025-69226: Fixed brute-force leak of internal static file path components (bsc#1256020).\n- CVE-2025-69224: Fixed unicode processing of header values could cause parsing discrepancies (bsc#1256018).\n- CVE-2025-69223: Fixed aiohttp HTTP Parser auto_decompress feature susceptible to zip bomb (bsc#1256017).\n- CVE-2025-69227: Fixed DoS when bypassing asserts (bsc#1256021).\n- CVE-2025-69225: Fixed unicode match groups in regexes for ASCII protocol elements (bsc#1256019).\n- CVE-2025-69229: Fixed DoS through chunked messages (bsc#1256023).\n- CVE-2025-53643: Fixed request smuggling due to incorrect parsing of chunked trailer section (bsc#1246517).\n\nChanges in python-Brotli:\n\n- Add max length decompression (bsc#1254867, bsc#1256017).\n","status":"published","published":"2026-02-12T14:01:04Z","modified":"2026-03-23T04:54:47.85306Z","updated_at":"2026-11-02T16:58:41.463445Z"},{"id":"SUSE-SU-2025:03057-1","title":"Security update for python-aiohttp","description":"This update for python-aiohttp fixes the following issues:\n\n- CVE-2025-53643: Fixed request smuggling due to incorrect parsing of chunked trailer section (bsc#1246517)\n","status":"published","published":"2025-09-03T12:48:44Z","modified":"2026-03-23T04:49:53.323252Z","updated_at":"2026-11-02T15:53:57.111474Z"},{"id":"SUSE-SU-2025:03201-1","title":"Security update for python-aiohttp","description":"This update for python-aiohttp fixes the following issues:\n\n- CVE-2025-53643: request smuggling vulnerability due to incorrect parsing trailer sections of an HTTP request\n  (bsc#1246517).\n","status":"published","published":"2025-09-12T12:24:43Z","modified":"2026-03-23T04:48:45.052424Z","updated_at":"2026-11-02T15:53:57.111474Z"},{"id":"SUSE-SU-2026:20425-1","title":"Security update for python-aiohttp, python-Brotli","description":"This update for python-aiohttp, python-Brotli fixes the following issues:\n\nChanges in python-aiohttp:\n\n- CVE-2025-69228: Fixed denial of service through large payloads (bsc#1256022).\n- CVE-2025-69226: Fixed brute-force leak of internal static file path components (bsc#1256020).\n- CVE-2025-69224: Fixed unicode processing of header values could cause parsing discrepancies (bsc#1256018).\n- CVE-2025-69223: Fixed aiohttp HTTP Parser auto_decompress feature susceptible to zip bomb (bsc#1256017).\n- CVE-2025-69227: Fixed DoS when bypassing asserts (bsc#1256021).\n- CVE-2025-69225: Fixed unicode match groups in regexes for ASCII protocol elements (bsc#1256019).\n- CVE-2025-69229: Fixed DoS through chunked messages (bsc#1256023).\n- CVE-2025-53643: Fixed request smuggling due to incorrect parsing of chunked trailer section (bsc#1246517).\n\nChanges in python-Brotli:\n\n- Add max length decompression (bsc#1254867, bsc#1256017).\n","status":"published","published":"2026-02-12T13:59:27Z","modified":"2026-03-23T04:52:53.669218Z","updated_at":"2026-11-02T15:54:01.953589Z"}]}}