Bug 2553136

Summary: CVE-2026-39834 keepassxc: golang.org/x/crypto/ssh: Denial of Service due to integer overflow in SSH channel write [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Avinash Hanwate <ahanwate>
Component: keepassxcAssignee: Germano Massullo (Thetra) <germano.massullo>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: daniel, germano.massullo, mikel, nixuser, nonamedotc
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["2d749e5e-fe0a-4fae-8339-549023987a9d"]}
Fixed In Version: keepassxc-2.8.0-2.fc44 keepassxc-2.8.0-2.fc43 keepassxc-2.8.0-2.fc45 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-24 16:37:57 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: 2480676    

Description Avinash Hanwate 2026-10-15 09:42:37 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.

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.

Comment 1 Fedora Update System 2026-10-22 23:40:26 UTC
FEDORA-2026-4d8f0cddef (keepassxc-2.8.0-2.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-4d8f0cddef

Comment 2 Fedora Update System 2026-10-23 01:51:47 UTC
FEDORA-2026-bba98ecbdd 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-bba98ecbdd`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-bba98ecbdd

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

Comment 3 Fedora Update System 2026-10-23 03:00:25 UTC
FEDORA-2026-4d8f0cddef 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-2026-4d8f0cddef`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-4d8f0cddef

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

Comment 4 Fedora Update System 2026-10-23 03:15:49 UTC
FEDORA-2026-8b97d39466 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-2026-8b97d39466`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8b97d39466

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

Comment 5 Fedora Update System 2026-10-24 16:37:57 UTC
FEDORA-2026-8b97d39466 (keepassxc-2.8.0-2.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-10-31 01:36:07 UTC
FEDORA-2026-4d8f0cddef (keepassxc-2.8.0-2.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-10-31 18:51:38 UTC
FEDORA-2026-bba98ecbdd (keepassxc-2.8.0-2.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.