{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-116579", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-26T15:03:39.035Z", "datePublished": "2026-10-26T20:29:22.906Z", "dateUpdated": "2026-10-26T20:29:22.906Z"}, "containers": {"cna": {"title": "Autobahn Python: permessage-brotli inflates a whole frame before maxMessagePayloadSize is checked (incomplete fix of GHSA-hxp9-w8x3-p566)", "problemTypes": [{"descriptions": [{"cweId": "CWE-409", "lang": "en", "description": "CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/crossbario/autobahn-python/security/advisories/GHSA-pjh6-c8mg-3x7m", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/crossbario/autobahn-python/security/advisories/GHSA-pjh6-c8mg-3x7m"}, {"name": "https://github.com/crossbario/autobahn-python/pull/1987", "tags": ["x_refsource_MISC"], "url": "https://github.com/crossbario/autobahn-python/pull/1987"}, {"name": "https://github.com/crossbario/autobahn-python/commit/a41442bbee4f6126a8ce1bb892840124c24d16f1", "tags": ["x_refsource_MISC"], "url": "https://github.com/crossbario/autobahn-python/commit/a41442bbee4f6126a8ce1bb892840124c24d16f1"}, {"name": "https://github.com/crossbario/autobahn-python/releases/tag/v26_10_1", "tags": ["x_refsource_MISC"], "url": "https://github.com/crossbario/autobahn-python/releases/tag/v26_10_1"}], "affected": [{"vendor": "crossbario", "product": "autobahn-python", "versions": [{"version": ">= 26.7.1, < 26.10.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-26T20:29:22.906Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-pjh6-c8mg-3x7m", "discovery": "UNKNOWN"}}}}

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