CVE-2026-102821— Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey
一分钟漏洞结论
影响对象
Eugeny russh
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Russh is a Rust SSH client and server library. Prior to 0.63.2, an authenticated remote peer can send SSH_MSG_KEXINIT without the required SSH_MSG_KEX_ECDH_INIT and then flood SSH_MSG_CHANNEL_OPEN messages while SessionKexState::InProgress prevents priority_re
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一、 漏洞 CVE-2026-102821 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey
来源: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client and server library. Prior to 0.63.2, an authenticated remote peer can send SSH_MSG_KEXINIT without the required SSH_MSG_KEX_ECDH_INIT and then flood SSH_MSG_CHANNEL_OPEN messages while SessionKexState::InProgress prevents priority_receiver in russh/src/server/session.rs from being drained. The server continues processing network input and enqueues a ChannelOpenReply for each request on an unbounded channel, allowing one connection to grow memory until the process is terminated. This issue is fixed in version 0.63.2.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-102821 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-102821 其他参考 (3)
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https://github.com/Eugeny/russh/releases/tag/v0.63.2 x_refsource_MISC
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https://github.com/Eugeny/russh/security/advisories/GHSA-35g8-35p8-c8fw x_refsource_CONFIRM
同批安全公告 · Eugeny · 2026-09-29 · 共 6 条
| CVE-2026-102823 | 7.5 HIGH | russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never |
| CVE-2026-102820 | 6.2 MEDIUM | pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a mali |
| CVE-2026-102824 | 4.3 MEDIUM | Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange |
| CVE-2026-102822 | 3.7 LOW | russh: negotiating a MAC-requiring block cipher (CTR/CBC) with mac=none causes a slice-ind |
| CVE-2026-102825 | 3.7 LOW | Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime |
IV. Related Vulnerabilities
Same product: russh
-
CVE-2026-102825
Russh: Configured server auth-attempt cap is not enforced in -
CVE-2026-102824
Russh: Missing X25519 zero-point validation in hybrid ML-KEM -
CVE-2026-102823
russh: Client-side channel-scoped Handler callbacks fire for -
CVE-2026-102822
russh: negotiating a MAC-requiring block cipher (CTR/CBC) wi -
CVE-2026-102820
pageant: Out-of-bounds read / oversized allocation in `pagea
Same vendor: Eugeny
-
CVE-2026-102825
Russh: Configured server auth-attempt cap is not enforced in -
CVE-2026-102824
Russh: Missing X25519 zero-point validation in hybrid ML-KEM -
CVE-2026-102823
russh: Client-side channel-scoped Handler callbacks fire for -
CVE-2026-102822
russh: negotiating a MAC-requiring block cipher (CTR/CBC) wi -
CVE-2026-102820
pageant: Out-of-bounds read / oversized allocation in `pagea
V. Comments for CVE-2026-102821
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