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SCA: security update for asyncssh (GHSA-qr67-gv47-xwwh)

medium Tenable Cloud Security Plugin ID 446359

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2
 protocol on top of the Python asyncio framework. Version 2.23.0 contains an incomplete fix for
 CVE-2026-45309 in SSHServerConfig._set_tokens that blocks /, , and .. before %u substitution in
 AuthorizedKeysFile but does not block a leading ~ or ${ENV}, allowing later expansion in _expand_val and
 Path(filename).expanduser() to escape the intended authorized-keys directory. This issue is fixed in
 version 2.23.1. (CVE-2026-54590)

Solution

Update the asyncssh library and its related packages to version 2.23.1 or later.

See Also

https://github.com/advisories/GHSA-qr67-gv47-xwwh

Plugin Details

Severity: Medium

ID: 446359

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/26/2026

Updated: 8/26/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.76

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2026-54590

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 8/26/2026

Vulnerability Publication Date: 7/8/2026

Reference Information

CVE: CVE-2026-54590