CVE-2026-54591
Last modified
CVE-2026-54591 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. EPSS estimates a 0.32% chance of exploitation in the next 30 days.
Description
AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| ronf | asyncssh | < 2.23.1 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-54591?
How severe is CVE-2026-54591?
How do I fix CVE-2026-54591?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-54573Outline is a service that allows for collaborative documenta…5.3
- CVE-2026-54574proot-distro is a utility for managing proot containers. Pri…8.2
- CVE-2026-5458A weakness has been identified in Noelse Individuals & Pro A…3.3
- CVE-2026-54588Poweradmin is a web-based DNS administration tool for PowerD…9.6
- CVE-2026-5459The User Frontend: AI Powered Frontend Posting, User Directo…5.3
- CVE-2026-54590AsyncSSH is a Python package which provides an asynchronous …5.9
- CVE-2026-54592Oj (Optimized JSON) is a JSON parser and Object marshaller p…7.5
- CVE-2026-54593Pterodactyl is a free, open-source game server management pa…8.1
- CVE-2026-5460A heap use-after-free exists in wolfSSL's TLS 1.3 post-quant…6.5
- CVE-2026-54601FastGPT is an open source AI knowledge base platform. From 4…6.3
- CVE-2026-54602FastGPT is a knowledge-based AI application platform. Prior …7.1
- CVE-2026-54603OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authoriza…8.6
Are you affected by CVE-2026-54591?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST