Bug 2502788

Summary:	CVE-2026-58055 nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Srikanth Balasubramanian <sbalasub>
Component:	nghttp2	Assignee:	Jan Macku <jamacku>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	jamacku, kdudka, msekleta
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["b7bf684c-59a7-45ee-a1ec-9b84e195f7b4"]}
Fixed In Version:	nghttp2-1.68.0-5.fc44 nghttp2-1.66.0-3.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-09 00:59:36 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:	2493954

Description Srikanth Balasubramanian 2026-07-20 13:17:08 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.

nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.

Comment 1 Fedora Update System 2026-08-07 11:44:06 UTC

FEDORA-2026-084c991d17 (nghttp2-1.68.0-5.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-084c991d17

Comment 2 Fedora Update System 2026-08-07 11:44:47 UTC

FEDORA-2026-91dd0c29d6 (nghttp2-1.66.0-3.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-91dd0c29d6

Comment 3 Fedora Update System 2026-08-08 01:41:49 UTC

FEDORA-2026-084c991d17 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-2026-084c991d17`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-084c991d17

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

Comment 4 Fedora Update System 2026-08-08 02:09:13 UTC

FEDORA-2026-91dd0c29d6 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-2026-91dd0c29d6`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-91dd0c29d6

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

Comment 5 Fedora Update System 2026-08-09 00:59:36 UTC

FEDORA-2026-084c991d17 (nghttp2-1.68.0-5.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-08-11 01:13:42 UTC

FEDORA-2026-91dd0c29d6 (nghttp2-1.66.0-3.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.