{"schema":"threatline.record/2","record":{"id":"CVE-2026-116579","aliases":["GHSA-pjh6-c8mg-3x7m"],"summary":"Autobahn Python: permessage-brotli inflates a whole frame before maxMessagePayloadSize is checked (incomplete fix of GHSA-hxp9-w8x3-p566)","details":"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.","categories":["Runtimes & languages"],"product":"autobahn-python","vendor":"crossbario","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-116579","source_modified_at":"2026-10-26T20:29:22.906Z","fetched_at":"2026-10-26T23:45:56.352924Z","product":"autobahn-python","vendor":"crossbario","versions":[{"version":">= 26.7.1, < 26.10.1","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":5.9,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-26T20:29:22.906Z","modified_at":"2026-10-26T20:29:22.906Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-116579","fetched_at":"2026-10-26T23:45:56.352924Z","source_modified_at":"2026-10-26T20:29:22.906Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/crossbario/autobahn-python/security/advisories/GHSA-pjh6-c8mg-3x7m","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/crossbario/autobahn-python/pull/1987","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/crossbario/autobahn-python/commit/a41442bbee4f6126a8ce1bb892840124c24d16f1","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/crossbario/autobahn-python/releases/tag/v26_10_1","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-26T20:29:22.906Z","content_hash":"c2e157df672d5db6e93ea5ea9e7621f30a11fe74509a0f629919f135e6763a53"}}