Bug 2494454

Summary:	CVE-2026-39833 vhs: golang.org/x/crypto/ssh/agent: Security bypass due to unenforced key confirmation [fedora-all]
Product:	[Fedora] Fedora	Reporter:	jkelly <jkelly>
Component:	vhs	Assignee:	Carl George 🤠 <carlwgeorge>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	45	CC:	carlwgeorge, go-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["28ae1c3c-f791-4399-96eb-f6f0b2d222a4"]}
Fixed In Version:	vhs-0.12.1-1.fc45 vhs-0.11.0-4.fc44	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-11-01 01:06:08 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:	2480683

Description jkelly 2026-06-29 15:36:24 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 in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.

Comment 1 Aoife Moloney 2026-08-17 15:04:55 UTC

This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 2 Fedora Update System 2026-10-23 23:47:07 UTC

FEDORA-2026-ff352aea5d (vhs-0.12.1-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ff352aea5d

Comment 3 Fedora Update System 2026-10-24 00:07:12 UTC

FEDORA-2026-ba39729bff (vhs-0.11.0-4.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ba39729bff

Comment 4 Fedora Update System 2026-10-24 17:26:27 UTC

FEDORA-2026-ba39729bff 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-ba39729bff`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-ba39729bff

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 18:16:41 UTC

FEDORA-2026-ff352aea5d 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-ff352aea5d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-ff352aea5d

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

Comment 6 Fedora Update System 2026-11-01 01:06:08 UTC

FEDORA-2026-ff352aea5d (vhs-0.12.1-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-11-01 03:35:04 UTC

FEDORA-2026-ff352aea5d (vhs-0.12.1-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-11-01 03:35:51 UTC

FEDORA-2026-ba39729bff (vhs-0.11.0-4.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.