{"id":"CVE-2026-116579","revision":null,"records":[{"revision":"aa129cba09ea48868046a1c11bb7b7c3","observedAt":"2026-10-27T15:44:06.157+00:00","statement":{"source":"cve-program","id":"CVE-2026-116579","aliases":[],"title":"Autobahn Python: permessage-brotli inflates a whole frame before maxMessagePayloadSize is checked (incomplete fix of GHSA-hxp9-w8x3-p566)","description":"Autobahn Python is a WebSocket and WAMP implementation for Python that supports Twisted and asyncio. From 26.7.1 until 26.10.1, PerMessageBrotli.decompress_message_data in compress_brotli.py calls the Brotli decompressor without an output limit and checks maxMessagePayloadSize only after a complete frame has been inflated. An unauthenticated WebSocket client can send a small, highly compressed frame that allocates hundreds of MiB before rejection, causing memory-exhaustion denial of service on servers that enable the opt-in permessage-brotli feature through the compress extra. Deflate and bzip2 already enforce the remaining output budget and are outside this residual vulnerability. This issue is fixed in version 26.10.1.","state":0,"publishedAt":"2026-10-26T20:29:22.906+00:00","modifiedAt":"2026-10-27T14:18:18.772+00:00","affected":[{"ecosystem":"Vendor product","name":"autobahn-python","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"crossbario\",\n                    \"product\": \"autobahn-python\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 26.7.1, < 26.10.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/crossbario/autobahn-python/security/advisories/GHSA-pjh6-c8mg-3x7m","https://github.com/crossbario/autobahn-python/pull/1987","https://github.com/crossbario/autobahn-python/commit/a41442bbee4f6126a8ce1bb892840124c24d16f1","https://github.com/crossbario/autobahn-python/releases/tag/v26_10_1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116579","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-116579","identifiers":["CVE-2026-116579"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-30T15:47:49.0266630+00:00","complete":true,"records":1764,"lastAttemptAt":"2026-10-30T15:47:49.026663+00:00","lastSuccessAt":"2026-10-30T15:47:49.1810146+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:47:49.1810155+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-7e2c4e7288f2c464ad8c61f3bb6017374714faedcc781283ac06a706ee1a820b-877befc2d62279d4ab9bcfe46d326c7323a92b5c5fef334f3c129ec56a5348ae","complete":true,"records":417180,"lastAttemptAt":"2026-10-30T15:45:42.4523092+00:00","lastSuccessAt":"2026-10-30T15:45:42.2641553+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:45:42.4523092+00:00","snapshotPublishedAt":"2026-10-30T15:27:40+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-404de5cfc23e45c599feca33b8ced28a","complete":false,"records":13526,"lastAttemptAt":"2026-10-30T15:55:54.0022124+00:00","lastSuccessAt":"2026-10-30T15:55:54.0530138+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:55:54.0530138+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-30T15:47:49.0266630+00:00","complete":true,"records":1094,"lastAttemptAt":"2026-10-30T15:47:49.026663+00:00","lastSuccessAt":"2026-10-30T15:47:49.1818062+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:47:49.1818068+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-ab12a0d4513f4be7a9c58cd604c95108","complete":false,"records":13544,"lastAttemptAt":"2026-10-30T15:48:14.4996449+00:00","lastSuccessAt":"2026-10-30T15:48:14.494+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:48:14.494+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13603,"expectedIdentifiers":13604,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-e091d9104aae1991994c868b5fad0248c9b288abafb7672fca8ae6500f97e080","complete":true,"records":9808,"lastAttemptAt":"2026-10-30T15:47:48.8610364+00:00","lastSuccessAt":"2026-10-30T15:47:48.5635219+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:47:48.8610364+00:00","snapshotPublishedAt":"2026-10-30T15:23:39+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-2de9ccc5290f060c7aa63f89c25dd76f655a64ba1aba7c05c97fa3bee4f09899","complete":true,"records":1967,"lastAttemptAt":"2026-10-30T15:45:42.5983328+00:00","lastSuccessAt":"2026-10-28T20:55:34.2982937+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:45:42.5983328+00:00","snapshotPublishedAt":"2026-10-28T20:03:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-f63fa91e750071ae88c9f82019ecd6c982fa4fcc1d3dc5ceb5d9c642fb6bf05c","complete":true,"records":3023,"lastAttemptAt":"2026-10-30T15:47:48.9735652+00:00","lastSuccessAt":"2026-10-30T11:49:36.4759887+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:47:48.9735652+00:00","snapshotPublishedAt":"2026-10-30T11:18:14+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-f835ee6763958dc737a96aa806bb1f739725810ceab9bd230dbd19be621e7aaf","complete":true,"records":230951,"lastAttemptAt":"2026-10-30T15:47:40.2387793+00:00","lastSuccessAt":"2026-10-30T15:47:38.7770997+00:00","error":null,"lastVerifiedAt":"2026-10-30T15:47:40.2387793+00:00","snapshotPublishedAt":"2026-10-30T15:23:44+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}