Bug 2524358 - CVE-2026-19538 nsd: nsd: Access control bypass via repeated queries on proxy protocol port [epel-all]
Summary: CVE-2026-19538 nsd: nsd: Access control bypass via repeated queries on proxy ...
Keywords:
Status: MODIFIED
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": ["8fb8b524-a7e9-441f-a55c-8...
Depends On:
Blocks: CVE-2026-19538
TreeView+ depends on / blocked
 
Reported: 2026-08-26 11:40 UTC by Vladimir Vasilev
Modified: 2026-08-28 07:31 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Vladimir Vasilev 2026-08-26 11:40:19 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.

The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.

Comment 1 Fedora Update System 2026-08-28 07:31:08 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 07:31:28 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


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