CVE-2026-115269

CVE-2026-115269 · HTTP/2 WINDOW_UPDATE and SETTINGS frames reset the request body read timeout in Bandit

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Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/2 request body reader of mtrudel bandit allows an unauthenticated remote attacker to hold stream processes open indefinitely via WINDOW_UPDATE or empty SETTINGS frames sent while a Plug reads the request body. Bandit.HTTP2.Stream.do_read_data/4 in lib/bandit/http2/stream.ex waits for each frame with a fresh read_timeout. A stream WINDOW_UPDATE, or the zero-delta window update that every empty SETTINGS frame delivers to all streams, ends the wait without delivering any body data, and the loop starts a new full countdown. A client that sends one of these 9-byte frames before each countdown expires keeps read_body blocked, together with the stream process and whatever the application holds while reading, for as long as it likes. This issue affects bandit: from 1.4.0 before 1.14.0.

CVSS 8.7 · High · EPSS 0.6% · Fix available

Published

2026-10-26T13:30:24.621Z

Updated

2026-10-26T15:35:52.079Z

Stack: system

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