Bug 2408355

Summary:	CVE-2025-58189 syncthing: go crypto/tls ALPN negotiation error contains attacker controlled information [fedora-43]
Product:	[Fedora] Fedora	Reporter:	Jon Moroney <jmoroney>
Component:	syncthing	Assignee:	Fabio Valentini <decathorpe>
Status:	ON_QA ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	43	CC:	decathorpe, go-sig, maxwell
Target Milestone:	---	Keywords:	Reopened, Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["3315d28f-56bc-48ea-9391-3ff13568ea24"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-09-07 05:57:09 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:	2407260

Description Jon Moroney 2025-10-30 20:04:14 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.

The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams

Comment 1 Fedora Update System 2026-10-07 16:40:17 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 2 Fedora Update System 2026-10-08 03:01:37 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.