Bug 2500376

Summary:	CVE-2026-10846 lego: ldns: Off-path poisoning attacks due to insufficient query-response matching [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Christopher Lusk <clusk>
Component:	lego	Assignee:	Mikel Olasagasti Uranga <mikel>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	rawhide	CC:	go-sig, mikel
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["63930efb-b642-45a5-8006-d535ac37660d"]}
Fixed In Version:	lego-5.3.1-2.fc44 lego-5.3.1-2.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-07-27 00:54:59 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:	2487437

Description Christopher Lusk 2026-07-14 18:17:26 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.

NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UDP, lacks matching the query destination address and port with the response source address and port. Furthermore not the query ID, neither the question of the query is matched with that of the response. This makes applications, that use ldns for (stub) resolver functionality over UDP, vulnerable for off-path poisoning attacks. The drill tool, which is shipped with ldns, suffers from this vulnerability.

Comment 1 Fedora Update System 2026-07-22 14:58:18 UTC

FEDORA-2026-30e8e9a2b2 (lego-5.3.1-2.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-30e8e9a2b2

Comment 2 Fedora Update System 2026-07-22 14:58:19 UTC

FEDORA-2026-256592dfe7 (lego-5.3.1-2.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-256592dfe7

Comment 3 Fedora Update System 2026-07-23 01:40:14 UTC

FEDORA-2026-30e8e9a2b2 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-2026-30e8e9a2b2`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-30e8e9a2b2

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

Comment 4 Fedora Update System 2026-07-23 01:54:34 UTC

FEDORA-2026-256592dfe7 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-2026-256592dfe7`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-256592dfe7

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

Comment 5 Fedora Update System 2026-07-27 00:54:59 UTC

FEDORA-2026-30e8e9a2b2 (lego-5.3.1-2.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 2026-07-31 01:13:12 UTC

FEDORA-2026-256592dfe7 (lego-5.3.1-2.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.