Bug 2526945

Summary: CVE-2026-84269 gvfs: AFP: heap-based buffer overflow in DSI read path [fedora-all]
Product: [Fedora] Fedora Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: gvfsAssignee: Adrian Vovk <avovk>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: avovk, gnome-sig, oholy
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["169f2844-7b1a-437b-89c3-c20ec0910148"]}
Fixed In Version: gvfs-1.58.4-4.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-03 00:59:11 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: 2526784    

Description Guilherme de Almeida Suckevicz 2026-09-01 17:43:52 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.

A flaw was found in the AFP backend in gvfs. When mounting a share, a malicious AFP server can cause the DSI read path to process a length that exceeds the size requested by the client. The function does not verify the server-provided length against the pre-sized reply buffer, causing the operation to access past the intended boundaries. This issue allows a malicious server to overflow a heap buffer and crash the gvfsd-afp process, resulting in a denial of service. This vulnerability affects all gvfs versions and is fixed in version 1.60.2.
Comment 1 Adrian Vovk 2026-09-01 22:43:34 UTC 
This CVE is already fixed in f44 (1.60.2), f45 (1.61.91), and rawhide (1.61.91)

Fix will need to be backported to f43
Comment 2 Fedora Update System 2026-09-01 23:32:15 UTC 
FEDORA-2026-571b7e1505 (gvfs-1.58.4-4.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-571b7e1505
Comment 3 Fedora Update System 2026-09-02 02:04:02 UTC 
FEDORA-2026-571b7e1505 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-2026-571b7e1505`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-571b7e1505

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 4 Fedora Update System 2026-09-03 00:59:11 UTC 
FEDORA-2026-571b7e1505 (gvfs-1.58.4-4.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.