CVE-2026-111061
CVE-2026-111061 · russh agent server converts constraint records into unbounded never-rolled-back tasks
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 4.3 · Medium · EPSS 0.3% · Public exploit · Fix available
- Published
- Updated
Stack: system
Affected products and versions
russh
- Versions
- < 0.64.1: Affected
No fix published
rust-russh Debian:14
- Versions
- 0.57.1-1
- 0.57.1-2
- Affected ranges
- ECOSYSTEM: < 0.64.1-1
Update to 0.64.1-1
rust-russh Ubuntu:26.10
- Versions
- 0.57.1-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published