Bug 2498017

Summary:	CVE-2026-11856 curl: curl: Information disclosure via incorrect Digest authentication header reuse [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Michalis Papadopoullos <mpapadop>
Component:	curl	Assignee:	Jan Macku <jamacku>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	jamacku, jmigacz, kdudka, lzaoral, msekleta, paul, vmihalko
Target Milestone:	---	Keywords:	Reopened, Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["82a7521b-aeb0-47b2-a009-b9009023b5f6"]}
Fixed In Version:	curl-8.18.0-8.fc44 curl-8.15.0-8.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-07 01:37:25 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:

Description Michalis Papadopoullos 2026-07-08 09:37:10 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.

Successfully using libcurl to do a transfer to a specific HTTP origin
(`hostA`) with **Digest** authentication and then changing the origin to a
different one (`hostB`) for a second transfer, reusing the same handle, makes
libcurl wrongly pass on the  `Authorization:` header field meant for `hostA`,
to `hostB`.

Comment 1 Fedora Update System 2026-07-31 12:02:53 UTC

FEDORA-2026-e691fbbfe7 (curl-8.18.0-8.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-e691fbbfe7

Comment 2 Fedora Update System 2026-08-01 15:55:59 UTC

FEDORA-2026-e691fbbfe7 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-e691fbbfe7`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-e691fbbfe7

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

Comment 3 Fedora Update System 2026-08-02 00:56:37 UTC

FEDORA-2026-e691fbbfe7 (curl-8.18.0-8.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 4 Fedora Update System 2026-08-04 08:42:17 UTC

FEDORA-2026-097fb2e7e9 (curl-8.15.0-8.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-097fb2e7e9

Comment 5 Fedora Update System 2026-08-05 01:32:58 UTC

FEDORA-2026-097fb2e7e9 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-2026-097fb2e7e9`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-097fb2e7e9

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

Comment 6 Fedora Update System 2026-08-07 01:37:25 UTC

FEDORA-2026-097fb2e7e9 (curl-8.15.0-8.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.