Bug 2498421

Summary:	CVE-2026-54590 python-asyncssh: AsyncSSH: Unauthorized file modification via authorized-keys directory escape [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Ganesh <gnaik>
Component:	python-asyncssh	Assignee:	Georg Sauthoff <fedora>
Status:	ON_QA ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	fedora, ktdreyer
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["04beefdf-9565-45a1-a165-e950140b873a"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2498264

Description Ganesh 2026-07-09 07:06:40 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Fedora Update System 2026-07-11 21:55:20 UTC

FEDORA-2026-1f248487e4 (python-asyncssh-2.24.0-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-1f248487e4

Comment 2 Fedora Update System 2026-07-11 23:26:01 UTC

FEDORA-2026-574496d9ae (python-asyncssh-2.23.1-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-574496d9ae

Comment 3 Fedora Update System 2026-07-12 01:33:27 UTC

FEDORA-2026-1f248487e4 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-1f248487e4`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-1f248487e4

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-07-12 01:51:24 UTC

FEDORA-2026-574496d9ae has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-574496d9ae`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-574496d9ae

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.