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CVE-2026-116579

5.9 medium SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 6

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-27 14:18
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-27 16:03
  3. StatusReceived → PublishedNVD modified 2026-10-27 14:18
  4. StatusPublished → ReceivedNVD modified 2026-10-27 15:16
  5. StatusReceived → PublishedNVD modified 2026-10-26 20:29
  6. First seenCVSS 5.9NVD modified 2026-10-26 21:18

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 4