{"id":"CVE-2026-59881","aliases":["AZL-94397","CLSA-2026-1786515832","CLSA-2026-1787723258","CLSA-2026-1787905713","CLSA-2026-1788442611","DEBIAN-CVE-2026-59881","EUVD-2026-51257","GHSA-mq44-7p77-q5h7","OESA-2026-3277","OESA-2026-3278","OESA-2026-3279","PYSEC-2026-3547","SUSE-SU-2026:23571-1","SUSE-SU-2026:4031-1","SUSE-SU-2026:4113-1","UBUNTU-CVE-2026-59881","openSUSE-SU-2026:11467-1","openSUSE-SU-2026:21687-1"],"status":"published","title":"AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 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16.0","package":"python-aiohttp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.11.16-160000.7.1"}]}],"bundled":3}],"products":[{"vendor":"aio-libs","product":"aiohttp"}],"references":[{"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7","tags":["x_refsource_CONFIRM","advisory","web","report"]},{"url":"https://github.com/aio-libs/aiohttp/pull/12978","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6","tags":["x_refsource_MISC","fix","web"]},{"url":"http://github.com/aio-libs/aiohttp/releases/tag/v3.14.2","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59881","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-mq44-7p77-q5h7","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59881.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-59881","tags":["advisory"]},{"url":"https://github.com/aio-libs/aiohttp","tags":["package"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3277","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3278","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3279","tags":["advisory"]},{"url":"https://pypi.org/project/aiohttp","tags":["package"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623571-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1273125","tags":["report"]},{"url":"https://bugzilla.suse.com/1273552","tags":["report"]},{"url":"https://bugzilla.suse.com/1273553","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-59881","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-69243","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-69244","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264031-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264113-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-59881","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-59881","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2021-21330","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-47627","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-47641","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-49081","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-23334","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-27306","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-42367","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-59881","title":"AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.","status":"published","published":"2026-07-30T17:34:32.415Z","modified":"2026-07-30T18:35:40.624Z","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","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:19:58.560602Z"}],"euvd":[{"id":"EUVD-2026-51257","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.","status":"published","published":"2026-07-30T17:34:32Z","modified":"2026-07-30T18:35:40Z","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"}],"updated_at":"2026-11-02T18:02:27.634971Z"}],"ghsa":[{"id":"GHSA-mq44-7p77-q5h7","title":"AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate","description":"### Summary\n\nThe client accepts and decompresses frames with the RSV1 bit set even when the `permessage-deflate` extension was not negotiated.\n\n### Impact\n\nA client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to be a significant issue unless a zip bomb vulnerability or similar is also present.\n\n---\n\nPatch: https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6","status":"published","published":"2026-08-03T20:40:55Z","modified":"2026-08-03T20:40:56Z","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"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:40:55.903445Z"}],"nvd":[{"id":"CVE-2026-59881","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.","status":"published","published":"2026-07-30T19:18:33.597Z","modified":"2026-10-23T22:10:00.16Z","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/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":"medium","assessor":"secondary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:12:33.955581Z"}],"osv":[{"id":"CVE-2026-59881","title":"AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.","status":"published","published":"2026-07-30T17:34:32.415Z","modified":"2026-11-10T02:45:41.360584744Z","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"}],"cwes":["CWE-20"],"updated_at":"2026-11-10T03:16:41.950556Z"},{"id":"DEBIAN-CVE-2026-59881","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.","status":"published","published":"2026-07-30T19:18:33.597Z","modified":"2026-11-01T00:00:11.337997054Z","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/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":"medium"}],"updated_at":"2026-11-02T15:45:57.932517Z"},{"id":"GHSA-mq44-7p77-q5h7","title":"AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate","description":"### Summary\n\nThe client accepts and decompresses frames with the RSV1 bit set even when the `permessage-deflate` extension was not negotiated.\n\n### Impact\n\nA client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to be a significant issue unless a zip bomb vulnerability or similar is also present.\n\n---\n\nPatch: https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6","status":"published","published":"2026-08-03T20:40:55Z","modified":"2026-09-10T03:51:14.489650589Z","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"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:46:52.170928Z"},{"id":"OESA-2026-3277","title":"python-aiohttp security update","description":"Async http client/server framework (asyncio).\n\nSecurity Fix(es):\n\nAIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.(CVE-2026-59881)","status":"published","published":"2026-08-07T06:48:17Z","modified":"2026-08-18T01:21:27.76469026Z","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"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"OESA-2026-3278","title":"python-aiohttp security update","description":"Async http client/server framework (asyncio).\n\nSecurity Fix(es):\n\nAIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.(CVE-2026-59881)","status":"published","published":"2026-08-07T06:59:46Z","modified":"2026-08-18T01:21:27.71133315Z","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"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"OESA-2026-3279","title":"python-aiohttp security update","description":"Async http client/server framework (asyncio).\n\nSecurity Fix(es):\n\nAIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.(CVE-2026-59881)","status":"published","published":"2026-08-07T06:59:55Z","modified":"2026-08-18T01:21:27.714686444Z","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"}],"updated_at":"2026-11-02T15:52:46.823443Z"},{"id":"PYSEC-2026-3547","title":"AIOHTTP: WebSocket client accepts compressed frames without negotiated permessage-deflate","description":"### Summary\n\nThe client accepts and decompresses frames with the RSV1 bit set even when the `permessage-deflate` extension was not negotiated.\n\n### Impact\n\nA client may unexpectedly decompress WebSocket frames when explicitly opted out. This could lead to additional CPU/memory consumption, but is unlikely to be a significant issue unless a zip bomb vulnerability or similar is also present.\n\n---\n\nPatch: https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6","status":"published","published":"2026-08-04T11:34:46.955491Z","modified":"2026-08-04T14:30:14.644343094Z","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"}],"updated_at":"2026-11-02T15:52:56.847083Z"},{"id":"UBUNTU-CVE-2026-59881","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.","status":"published","published":"2026-07-30T19:18:00Z","modified":"2026-10-17T12:59:15.074932346Z","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"}],"updated_at":"2026-11-02T16:56:41.911783Z"},{"id":"AZL-94397","title":"CVE-2026-59881 affecting package python-aiohttp 3.6.2-3","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.","status":"published","published":"2026-07-30T19:18:33Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:26.077208Z"},{"id":"CLSA-2026-1786515832","title":"TuxCare security update for aiohttp (3 CVEs)","description":"TuxCare rebuilt aiohttp to address 3 CVEs. Fixed in 3.8.6.post9+tuxcare.","status":"published","published":"2026-08-12T06:23:52Z","modified":"2026-10-15T09:48:05.422150122Z","updated_at":"2026-11-02T15:43:46.850893Z"},{"id":"CLSA-2026-1787723258","title":"TuxCare security update for aiohttp (3 CVEs)","description":"TuxCare rebuilt aiohttp to address 3 CVEs. Fixed in 3.8.5.post10+tuxcare.","status":"published","published":"2026-08-26T05:47:38Z","modified":"2026-10-15T09:48:05.802692255Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"CLSA-2026-1787905713","title":"TuxCare security update for aiohttp (2 CVEs)","description":"TuxCare rebuilt aiohttp to address 2 CVEs. Fixed in 3.8.4.post7+tuxcare.","status":"published","published":"2026-08-28T08:28:33Z","modified":"2026-10-15T09:47:40.884325023Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"CLSA-2026-1788442611","title":"TuxCare security update for aiohttp (1 CVE)","description":"TuxCare rebuilt aiohttp to address 1 CVE. Fixed in 3.8.1.post12+tuxcare.","status":"published","published":"2026-09-03T13:36:51Z","modified":"2026-10-15T09:48:01.252233481Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"openSUSE-SU-2026:11467-1","title":"python313-aiohttp-3.14.3-1.1 on GA media","description":"These are all security issues fixed in the python313-aiohttp-3.14.3-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-08-06T00:00:00Z","modified":"2026-08-07T10:00:44.119328568Z","updated_at":"2026-11-02T16:58:39.516824Z"},{"id":"openSUSE-SU-2026:21687-1","title":"Security update for python-aiohttp","description":"This update for python-aiohttp fixes the following issues:\n\n- CVE-2026-59881: excessive resource consumption due to WebSocket client accepting compressed frames without negotiated\n  permessage-deflate (bsc#1273125).\n- CVE-2026-69243: HTTP request smuggling via the WebSocket upgrade procedure (bsc#1273553).\n- CVE-2026-69244: out-of-bounds heap read in the C response parser while building an error message for a malformed\n  response (bsc#1273552).\n","status":"published","published":"2026-08-30T14:37:24Z","modified":"2026-08-31T18:15:05.145803963Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:23571-1","title":"Security update for python-aiohttp","description":"This update for python-aiohttp fixes the following issues:\n\n- CVE-2026-59881: excessive resource consumption due to WebSocket client accepting compressed frames without negotiated\n  permessage-deflate (bsc#1273125).\n- CVE-2026-69243: HTTP request smuggling via the WebSocket upgrade procedure (bsc#1273553).\n- CVE-2026-69244: out-of-bounds heap read in the C response parser while building an error message for a malformed\n  response (bsc#1273552).\n","status":"published","published":"2026-08-30T14:38:11Z","modified":"2026-09-29T18:23:09.295729438Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:4031-1","title":"Security update for python-aiohttp","description":"This update for python-aiohttp fixes the following issues:\n\n- CVE-2026-59881: excessive resource consumption due to WebSocket client accepting compressed frames without negotiated\n  permessage-deflate (bsc#1273125).\n- CVE-2026-69243: HTTP request smuggling via the WebSocket upgrade procedure (bsc#1273553).\n- CVE-2026-69244: out-of-bounds heap read in the C response parser while building an error message for a malformed\n  response (bsc#1273552).\n","status":"published","published":"2026-09-07T07:46:19Z","modified":"2026-09-13T18:23:17.06228763Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:4113-1","title":"Security update for python-aiohttp","description":"This update for python-aiohttp fixes the following issues:\n\n- CVE-2026-59881: excessive resource consumption due to WebSocket client accepting compressed frames without negotiated\n  permessage-deflate (bsc#1273125).\n- CVE-2026-69243: HTTP request smuggling via the WebSocket upgrade procedure (bsc#1273553).\n","status":"published","published":"2026-09-09T16:19:34Z","modified":"2026-09-14T18:23:14.421586887Z","updated_at":"2026-11-02T15:54:05.392906Z"}]}}