asyncssh
AsyncSSH: Asynchronous SSHv2 client and server library
Decision gist · record as of 2026-08-14
Yes. AsyncSSH is a mature, actively maintained library with low install friction, no known vulnerabilities, and strong support for modern Python versions. The copyleft license (EPL-2.0 or GPL-2.0-or-later) requires attention if you plan to distribute proprietary software, but poses no barrier for internal or open-source use. Install it if you need async SSH functionality in Python.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later and cryptography 39.0 or later.
- Optional features (U2F/FIDO2, PKCS#11, GSSAPI, post-quantum algorithms) require additional system libraries or Python packages.
- Low install friction with only two runtime dependencies (cryptography and typing_extensions).
License · maintenance · safety
EPL-2.0 OR GPL-2.0-or-later (copyleft) — Dual-licensed under EPL-2.0 or GPL-2.0-or-later (copyleft). Users must comply with one of these licenses; GPL-2.0-or-later imposes source-code distribution obligations if the package is distributed as part of a larger work.
last release 2026-06-27 (48 days) · last repo commit 2026-08-08 · 1,751 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 19,391,101 downloads/mo, #1,066 on PyPI
Alternatives
Verify before relying
pip install asyncssh
import asyncio
import asyncssh
async def run_client():
async with asyncssh.connect('localhost') as conn:
result = await conn.run('echo "Hello!"', check=True)
print(result.stdout, end='')
asyncio.run(run_client())- Performance characteristics under high concurrency or large file transfers
- Compatibility with specific SSH server implementations beyond OpenSSH
- Security audit status or third-party security review history
What it is and what it does
AsyncSSH is a production-grade SSH protocol library built on Python's asyncio framework. It implements both client and server sides of SSHv2, SFTP, and SCP, allowing you to run remote commands, transfer files, forward ports, and manage SSH tunnels asynchronously within a single event loop. The package handles key exchange, multiple authentication methods (public key, password, keyboard-interactive), and session management, with support for modern algorithms including post-quantum key exchange (ML-KEM, SNTRUP).
The library is designed for developers who need SSH functionality in async Python applications—whether building automation tools, remote administration systems, or integrating SSH into larger async services. It depends only on cryptography and typing_extensions at runtime, with optional extras for enhanced features like FIDO2 security keys, PKCS#11 tokens, and GSSAPI authentication. The codebase is actively maintained, supports Python 3.10 through 3.14, and carries no known vulnerabilities.
Use it for
- Automate remote command execution and file transfers in async Python applications without blocking the event loop.
- Build SSH-based tunneling and port-forwarding services that handle multiple concurrent connections efficiently.
- Implement custom SSH servers for embedded systems, IoT devices, or specialized remote-access protocols.
- Integrate SSH key management and authentication into larger async frameworks or microservices.
- Execute batch operations across multiple remote hosts concurrently using a single asyncio event loop.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
AsyncSSH is a mature, actively maintained library with low install friction, no known vulnerabilities, and strong support for modern Python versions. The copyleft license (EPL-2.0 or GPL-2.0-or-later) requires attention if you plan to distribute proprietary software, but poses no barrier for internal or open-source use. Install it if you need async SSH functionality in Python.
Install
asyncssh on PyPI
Before you install
Low install friction with only two runtime dependencies (cryptography and typing_extensions). Active maintenance with a recent release 48 days ago and ongoing repository activity. Supports current Python versions (3.10–3.14).
Requires Python 3.10 or later and cryptography 39.0 or later. Optional features (U2F/FIDO2, PKCS#11, GSSAPI, post-quantum algorithms) require additional system libraries or Python packages.
License in practice
Dual-licensed under EPL-2.0 or GPL-2.0-or-later (copyleft). Users must comply with one of these licenses; GPL-2.0-or-later imposes source-code distribution obligations if the package is distributed as part of a larger work.
Quickstart
pip install asyncssh
import asyncio
import asyncssh
async def run_client():
async with asyncssh.connect('localhost') as conn:
result = await conn.run('echo "Hello!"', check=True)
print(result.stdout, end='')
asyncio.run(run_client())Verify before relying
- Performance characteristics under high concurrency or large file transfers
- Compatibility with specific SSH server implementations beyond OpenSSH
- Security audit status or third-party security review history
Package facts
| License | EPL-2.0 OR GPL-2.0-or-later copyleft |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagescryptographytyping_extensions |
| Maintenance | Actively maintained 48 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 19,391,101 / month, #1,066 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: ConsoleIntended Audience :: DevelopersLicense :: OSI ApprovedOperating System :: MacOS :: MacOS XOperating System :: POSIXProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: InternetTopic :: Security :: CryptographyTopic :: Software Development :: Libraries :: Python ModulesTopic :: System :: Networking |
Evidence: asyncssh-2.24.0-py3-none-any.whl
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See also parallel-ssh · sshfs · sshpubkeys · scp · fs.sshfs · sftpretty · sshuttle · mock-ssh-server · paramiko · pproxy