Bug 2518054

Summary:	CVE-2026-72815 opkssh: go-chi chi: IP spoofing via X-Forwarded-For header allows bypass of access controls [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Joel Chamberlain <jochambe>
Component:	opkssh	Assignee:	Till Hofmann <thofmann>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	go-sig, thofmann
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["8fb97718-ab21-44cf-bd21-747a7cb3a70d"]}
Fixed In Version:	opkssh-0.16.0-2.fc43 opkssh-0.16.0-2.fc44	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-31 16:59:11 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:	2515988

Description Joel Chamberlain 2026-08-18 16:42:03 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.

go-chi chi versions >= 5.2.1 and before 5.3.0 contain an IP spoofing vulnerability in the RealIP middleware, which blindly trusts the first (leftmost) value of the X-Forwarded-For HTTP header. A remote attacker can bypass IP-based access control lists and rate-limiting mechanisms, and forge log entries, by supplying a spoofed IP address in the X-Forwarded-For header. The issue is fixed in version 5.3.0.

Comment 1 Fedora Update System 2026-08-19 08:38:21 UTC

FEDORA-2026-f5a5073561 (opkssh-0.16.0-2.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-f5a5073561

Comment 2 Fedora Update System 2026-08-19 08:39:12 UTC

FEDORA-2026-8d9ba295e0 (opkssh-0.16.0-2.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-8d9ba295e0

Comment 3 Fedora Update System 2026-08-20 16:39:26 UTC

FEDORA-2026-f5a5073561 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-f5a5073561`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f5a5073561

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

Comment 4 Fedora Update System 2026-08-20 16:40:02 UTC

FEDORA-2026-8d9ba295e0 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-2026-8d9ba295e0`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8d9ba295e0

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

Comment 5 Fedora Update System 2026-08-31 16:59:11 UTC

FEDORA-2026-8d9ba295e0 (opkssh-0.16.0-2.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-08-31 17:15:44 UTC

FEDORA-2026-f5a5073561 (opkssh-0.16.0-2.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.