Bug 2527317 - CVE-2026-5704 tar: tar: Hidden file injection via crafted archives [fedora-all]
Summary: CVE-2026-5704 tar: tar: Hidden file injection via crafted archives [fedora-all]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: tar
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Pavel Cahyna
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["e59af0b9-26c1-49bb-a984-8...
Depends On:
Blocks: CVE-2026-5704
TreeView+ depends on / blocked
 
Reported: 2026-09-02 10:53 UTC by Tomas Hoger
Modified: 2026-09-12 00:19 UTC (History)
5 users (show)

Fixed In Version: tar-1.35-10.fc45
Clone Of:
Environment:
Last Closed: 2026-09-12 00:19:22 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

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.


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