2503063 – (CVE-2026-44690) CVE-2026-44690 unbound: Unbound: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes

Bug 2503063 (CVE-2026-44690) - CVE-2026-44690 unbound: Unbound: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes

Summary: CVE-2026-44690 unbound: Unbound: Cache poisoning via insufficient RRSIG.Label...

Keywords:
Status:	NEW
Alias:	CVE-2026-44690
Deadline:	2026-07-22
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	high
Severity:	high
Target Milestone:	---
Assignee:	Product Security
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:	2507650
Blocks:
TreeView+	depends on / blocked

Reported:	2026-07-20 21:57 UTC by OSIDB Bzimport
Modified:	2026-10-18 08:43 UTC (History)
CC List:	18 users (show)
Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2026:55784	None	None	None	2026-08-17 18:16:03 UTC
Red Hat Product Errata	RHSA-2026:55841	None	None	None	2026-08-17 21:16:05 UTC
Red Hat Product Errata	RHSA-2026:55892	None	None	None	2026-08-17 23:03:30 UTC
Red Hat Product Errata	RHSA-2026:60440	None	None	None	2026-09-01 21:38:46 UTC

Description OSIDB Bzimport 2026-07-20 21:57:14 UTC

Insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning that permits a malicious actor controlling a single delegated zone to poison 
arbitrary sibling zones under NSEC-signed parent domains. Unbound 1.25.2 includes fixes to add lower-bound check in RRSIG labels, move cache write stricly after validation and adding bailiwick check when updating wildcards.

Comment 2 errata-xmlrpc 2026-08-17 18:16:02 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:55784 https://access.redhat.com/errata/RHSA-2026:55784

Comment 3 errata-xmlrpc 2026-08-17 21:16:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:55841 https://access.redhat.com/errata/RHSA-2026:55841

Comment 4 errata-xmlrpc 2026-08-17 23:03:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:55892 https://access.redhat.com/errata/RHSA-2026:55892

Comment 5 errata-xmlrpc 2026-09-01 21:38:44 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.22

Via RHSA-2026:60440 https://access.redhat.com/errata/RHSA-2026:60440

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