Bug 2535979

Summary: CVE-2026-77407 syncthing: RabbitMQ amqp091-go: Plaintext Credential Exposure via Exported PLAIN Authentication Fields [fedora-all]
Product: [Fedora] Fedora Reporter: Vipul Nair <vinair>
Component: syncthingAssignee: Fabio Valentini <decathorpe>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: decathorpe, go-sig, gwync, maxwell
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["b867578f-894a-47a2-a37f-a9631b49d974"]}
Fixed In Version: syncthing-2.1.6-1.fc44 syncthing-2.1.6-1.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-16 16:33:20 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: 2535487    

Description Vipul Nair 2026-09-17 12:47:23 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.

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, PlainAuth values defined in auth.go retain passwords as exported plaintext fields in Connection.Config.SASL after a successful PLAIN authentication handshake. The Connection.openComplete method in connection.go does not clear those values. Code with access to the Connection object, including reflective loggers, application performance monitoring agents, debugging utilities, and panic handlers, can traverse the configuration and expose the credentials to logs or state captures. The credential remains available for the lifetime of the connection instead of being cleared after authentication. This issue is fixed in version 1.13.0.

Comment 1 Fedora Update System 2026-10-07 16:38:51 UTC
FEDORA-2026-773e644d9d (syncthing-2.1.6-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-773e644d9d

Comment 2 Fedora Update System 2026-10-07 16:39:12 UTC
FEDORA-2026-0344d4bcdb (syncthing-2.1.6-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-0344d4bcdb

Comment 3 Fedora Update System 2026-10-07 16:40:20 UTC
FEDORA-2026-a5b9928f10 (syncthing-2.1.6-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-a5b9928f10

Comment 4 Fedora Update System 2026-10-08 02:09:15 UTC
FEDORA-2026-773e644d9d 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-2026-773e644d9d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-773e644d9d

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

Comment 5 Fedora Update System 2026-10-08 02:32:21 UTC
FEDORA-2026-0344d4bcdb 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-2026-0344d4bcdb`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-0344d4bcdb

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

Comment 6 Fedora Update System 2026-10-08 03:01:49 UTC
FEDORA-2026-a5b9928f10 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-a5b9928f10`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-a5b9928f10

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

Comment 7 Fedora Update System 2026-10-16 16:33:20 UTC
FEDORA-2026-0344d4bcdb (syncthing-2.1.6-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-10-16 16:50:32 UTC
FEDORA-2026-a5b9928f10 (syncthing-2.1.6-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.