CVE-2026-111061— russh agent server converts constraint records into unbounded never-rolled-back tasks
Quick assessment
Affected
Eugeny russh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
russh 是一个用 Rust 编写的 SSH 客户端和服务器库，其中包含了 SSH 代理协议的实现。在 0.64.1 版本之前，当处理带有约束的添加密钥请求时，代理服务器会为每个 记录启动一个独立的长生命周期任务。该实现中的循环会接受重复的生命周期记录，将密钥数据块克隆到每个任务中，并且在后续约束解析失败时不会回滚已创建的任务。攻击者若能在本地或通过代理转发与代理协议通信，即可耗尽内存和任务资源，导致代理进程因资源饥饿或终止而无法提供 SSH 代理服务。该问题已在 0.64.1 版本中修复。
Possible ATT&CK Techniques 1 AI
T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-111061
Vulnerability Information
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Vulnerability Title
russh agent server converts constraint records into unbounded never-rolled-back tasks
Source: CVE Program / CVE List V5
Vulnerability Description
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.64.1, the agent server spawns a separate long-lived task for every SSH_AGENT_CONSTRAIN_LIFETIME record in a constrained add-key request. The loop accepts repeated lifetime records, clones the key blob into each task, and does not roll back tasks when later constraint parsing fails. An attacker that can speak the agent protocol locally or through agent forwarding can exhaust memory and tasks until the agent process is starved or terminated, denying SSH agent service. This issue is fixed in version 0.64.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-111061
| # | POC Description | Source Link | Shenlong Link |
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Other References for CVE-2026-111061 (3)
-
https://github.com/Eugeny/russh/releases/tag/v0.64.1 x_refsource_MISC
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https://github.com/Eugeny/russh/security/advisories/GHSA-4wc5-f2rc-q74m x_refsource_CONFIRM
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V. Comments for CVE-2026-111061
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