Bug 2506753

Summary:	CVE-2026-52684 pdns-recursor: prefetch feature allows persistent ghost domain cache poisoning attack [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	pdns-recursor	Assignee:	Filipe Rosset <rosset.filipe>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	low
Version:	rawhide	CC:	rosset.filipe, ruben, sander
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["b6dc092c-08a0-46f8-ba09-fdea064aa5cc"]}
Fixed In Version:	pdns-recursor-5.4.5-2.el10_3 pdns-recursor-5.4.5-2.fc44 pdns-recursor-5.4.5-2.el10_2 pdns-recursor-5.2.13-1.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-17 00:28:06 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:	2506361

Description Guilherme de Almeida Suckevicz 2026-07-24 14:58:52 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.

If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the 
child records are used immediately if not expired and thus valid, or the
 records are expired, and in that case not used.  So this case 
can only happen if almost expired records are used to refresh the 
authoritative NS records.

Comment 1 Fedora Update System 2026-08-08 00:17:26 UTC

FEDORA-2026-ac51ed6e75 (pdns-recursor-5.2.13-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ac51ed6e75

Comment 2 Fedora Update System 2026-08-08 00:17:27 UTC

FEDORA-EPEL-2026-3afb49ff26 (pdns-recursor-5.4.5-2.el10_2) has been submitted as an update to Fedora EPEL 10.2.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-3afb49ff26

Comment 3 Fedora Update System 2026-08-08 00:17:28 UTC

FEDORA-2026-707054d631 (pdns-recursor-5.4.5-2.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-707054d631

Comment 4 Fedora Update System 2026-08-09 01:24:15 UTC

FEDORA-EPEL-2026-6aa47fdac2 has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-6aa47fdac2

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 01:36:53 UTC

FEDORA-EPEL-2026-3afb49ff26 has been pushed to the Fedora EPEL 10.2 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-3afb49ff26

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

Comment 6 Fedora Update System 2026-08-09 01:40:14 UTC

FEDORA-2026-707054d631 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-2026-707054d631`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-707054d631

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

Comment 7 Fedora Update System 2026-08-09 01:58:41 UTC

FEDORA-2026-ac51ed6e75 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-ac51ed6e75`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-ac51ed6e75

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

Comment 8 Fedora Update System 2026-08-17 00:28:06 UTC

FEDORA-EPEL-2026-6aa47fdac2 (pdns-recursor-5.4.5-2.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-08-17 00:51:09 UTC

FEDORA-2026-707054d631 (pdns-recursor-5.4.5-2.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 10 Fedora Update System 2026-08-17 00:53:58 UTC

FEDORA-EPEL-2026-3afb49ff26 (pdns-recursor-5.4.5-2.el10_2) has been pushed to the Fedora EPEL 10.2 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 11 Fedora Update System 2026-08-17 01:10:41 UTC

FEDORA-2026-ac51ed6e75 (pdns-recursor-5.2.13-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.