Bug 2524355 - CVE-2026-19401 nsd: NSD: Remote denial of service via crafted DNS Cookie options [epel-all]
Summary: CVE-2026-19401 nsd: NSD: Remote denial of service via crafted DNS Cookie opti...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora EPEL
Classification: Fedora
Component: nsd
Version: epel10
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Paul Wouters
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["790a03e4-cf3d-4f3b-a570-3...
Depends On:
Blocks: CVE-2026-19401
TreeView+ depends on / blocked
 
Reported: 2026-08-26 11:39 UTC by Vladimir Vasilev
Modified: 2026-09-08 01:10 UTC (History)
3 users (show)

Fixed In Version: nsd-4.15.1-1.el10_4 nsd-4.15.1-1.el10_3 nsd-4.15.1-1.el9 nsd-4.15.1-1.fc43 nsd-4.15.1-1.el10_2 nsd-4.15.1-1.fc44
Clone Of:
Environment:
Last Closed: 2026-09-08 00:27:02 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Vladimir Vasilev 2026-08-26 11:39:51 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.

Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options (17 when UDP payload size is 512). By continuously crashing the serve childs, the remote client can severely hamper or, when positioned sufficiently close, deny all DNS service.

Comment 1 Fedora Update System 2026-08-28 07:30:58 UTC
FEDORA-2026-3ff003d397 (nsd-4.15.1-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3ff003d397

Comment 2 Fedora Update System 2026-08-28 07:31:20 UTC
FEDORA-EPEL-2026-5064a05224 (nsd-4.15.1-1.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-5064a05224

Comment 3 Fedora Update System 2026-08-31 17:51:04 UTC
FEDORA-2026-bf1539678e 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-bf1539678e`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-bf1539678e

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

Comment 4 Fedora Update System 2026-08-31 18:02:45 UTC
FEDORA-EPEL-2026-c16f6b76bf has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-c16f6b76bf

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 18:11:46 UTC
FEDORA-2026-3ff003d397 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-2026-3ff003d397`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3ff003d397

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

Comment 6 Fedora Update System 2026-08-31 18:13:47 UTC
FEDORA-EPEL-2026-b69054a78f 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-b69054a78f

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

Comment 7 Fedora Update System 2026-08-31 18:22:54 UTC
FEDORA-EPEL-2026-5064a05224 has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-5064a05224

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

Comment 8 Fedora Update System 2026-08-31 18:26:06 UTC
FEDORA-2026-c56ac69334 has been pushed to the Fedora 45 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-c56ac69334`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-c56ac69334

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

Comment 9 Fedora Update System 2026-08-31 18:30:28 UTC
FEDORA-EPEL-2026-4a0c7835ec 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-2026-4a0c7835ec

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

Comment 10 Fedora Update System 2026-09-08 00:27:02 UTC
FEDORA-EPEL-2026-c16f6b76bf (nsd-4.15.1-1.el10_4) has been pushed to the Fedora EPEL 10.4 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 11 Fedora Update System 2026-09-08 00:30:17 UTC
FEDORA-EPEL-2026-b69054a78f (nsd-4.15.1-1.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 12 Fedora Update System 2026-09-08 00:44:51 UTC
FEDORA-EPEL-2026-5064a05224 (nsd-4.15.1-1.el9) has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 13 Fedora Update System 2026-09-08 00:56:03 UTC
FEDORA-2026-3ff003d397 (nsd-4.15.1-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 14 Fedora Update System 2026-09-08 01:04:33 UTC
FEDORA-EPEL-2026-4a0c7835ec (nsd-4.15.1-1.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 15 Fedora Update System 2026-09-08 01:10:55 UTC
FEDORA-2026-bf1539678e (nsd-4.15.1-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.


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