CVE-2026-116774

CVE-2026-116774 · russh: peer-declared zero maximum packet size permanently stalls channel writes (silent AsyncWrite hang)

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russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.60.0 until 0.65.0, channel-open parsing accepts a peer-declared maximum_packet_size of zero and passes it into ChannelTx::poll_writable in russh/src/channels/io/tx.rs. The Channel::data, Channel::make_writer, and Channel::into_stream asynchronous write paths then calculate a writable size of zero and remain pending forever because window adjustments cannot satisfy a static zero packet maximum. An authenticated client can strand server writes, and a malicious server can strand client writes, allowing affected tasks, channels, and connections to accumulate without surfacing an error. This issue is fixed in version 0.65.0.

CVSS 4.3 · Средний · EPSS 0,3%

Опубликовано

2026-10-27T20:25:26.914Z

Обновлено

2026-10-28T16:13:18.607Z

Стек: system

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