Bug 2527317

Summary:	CVE-2026-5704 tar: tar: Hidden file injection via crafted archives [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Tomas Hoger <thoger>
Component:	tar	Assignee:	Pavel Cahyna <pcahyna>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	kdudka, ovasik, pcahyna, pkubat, praiskup
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["e59af0b9-26c1-49bb-a984-8a3900b3d7cf"]}
Fixed In Version:	tar-1.35-10.fc45	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-09-12 00:19:22 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2455360

Description Tomas Hoger 2026-09-02 10:53:09 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.

Summary:
Hello Red Hat Security Team,

Patch Available:
no

Version Fixed:
N/A

Impact:
Hidden file injection with fully attacker-controlled content

Bypass of pre-extraction inspection mechanisms

Single-implementation inconsistency (no cross-tool pipeline required)

 Attack complexity: Low (crafted archive is < 3 KB, no special privileges)

 Affected typeflags: '2', '3', '4', '6' (4 of 5 non-data typeflags)

 Upstream report: sent concurrently to bug-tar

 I have attached the full advisory, a standalone PoC generator, and four minimal PoC archives. I am available for any clarification needed.

 Regards,

Guillermo de Angel

Comment 1 Fedora Update System 2026-09-09 14:16:23 UTC

FEDORA-2026-ee1eb89e7b (tar-1.35-10.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ee1eb89e7b

Comment 2 Fedora Update System 2026-09-10 02:17:49 UTC

FEDORA-2026-ee1eb89e7b has been pushed to the Fedora 45 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-ee1eb89e7b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-ee1eb89e7b

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

Comment 3 Fedora Update System 2026-09-12 00:19:22 UTC

FEDORA-2026-ee1eb89e7b (tar-1.35-10.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.