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Advisory severityHigh8.1Red Hat Linux

High [CVE-2026-54591] Arbitrary file write via path traversal in SCP client

This high-severity Red Hat Linux advisory covers CVE-2026-54591.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-54591 Source published Source updated

VulniPulse record published Record updated

CVE-2026-54591
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

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. This could allow the server to write arbitrary files to the client's filesystem, leading to unauthorized data modification or system disruption.

Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H). Weakness: CWE-22.

Is CVE-2026-54591 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-54591 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-54591?

Upgrade to a fixed release named by Red Hat:

  • 2.23.1

Confirm against the vendor advisory before you patch.

Affected versions
  • < 2.23.1

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Fixed versions
  • 2.23.1

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • The core risk of this flaw is that the malicious server uses a path traversal trick to write files where it shouldn't on your client (like overwriting /etc/shadow or critical system binaries). By making the container's root filesystem read-only, you completely neutralize this attack. Even if the vulnerability is triggered, the container's kernel will block the unauthorized write attempt.

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

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