EUVD-2026-26716
GHSA-q6v9-r226-v65f
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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7DescriptionNVD
Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated memory exhaustion via oversized HTTP/2 frames.
'Elixir.Bandit.HTTP2.Frame':deserialize/2 in lib/bandit/http2/frame.ex checks the SETTINGS_MAX_FRAME_SIZE limit only after pattern-matching payload::binary-size(length), which requires the entire frame body to be present in memory before either the accept or reject clause can fire. A peer that announces a frame length up to the 24-bit maximum (~16 MiB) causes the server to buffer that entire body before the size guard is evaluated, regardless of the max_frame_size negotiated during the HTTP/2 handshake (default 16 KiB per RFC 9113).
An unauthenticated attacker holding many concurrent connections can force the server to buffer far more memory than the negotiated frame size limit should permit, leading to memory pressure and potential denial of service.
This issue affects bandit: from 0.3.6 before 1.11.0.
AnalysisAI
Denial of service in mtrudel bandit via HTTP/2 frame deserialization allows unauthenticated remote attackers to exhaust server memory by sending oversized frames. The vulnerability exists because the HTTP/2 frame parser in 'Elixir.Bandit.HTTP2.Frame':deserialize/2 performs the max frame size check after pattern-matching the entire payload into memory, rather than before, allowing attackers to force buffering of up to 16 MiB frames regardless of negotiated limits. …
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