Bug 2518198

Summary:	CVE-2026-72817 opkssh: go-chi/chi: IP spoofing via X-Forwarded-For header manipulation [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": ["b6bccb8f-a266-470a-b845-091a4c96440a"]}
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 16:59:21 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:	2516008

Description Joel Chamberlain 2026-08-18 19:42:10 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 0.9.0 before 5.3.0 contains an IP spoofing vulnerability in the RealIP middleware, which resolves the request source IP (Request.RemoteAddr) using the first IP in the X-Forwarded-For header without validating trusted proxies. A malicious client can prepend a forged IP as the first value of the X-Forwarded-For header to spoof the request source IP, potentially bypassing access controls or falsifying request logs.

Comment 1 Fedora Update System 2026-08-19 08:38:24 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 08:39:15 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 16:39:28 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 16:40:04 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 16:59:21 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 17:15:45 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.