Bug 2449783 (CVE-2026-4438) - CVE-2026-4438 glibc: glibc: Invalid DNS hostname returned via gethostbyaddr functions
Summary: CVE-2026-4438 glibc: glibc: Invalid DNS hostname returned via gethostbyaddr f...
Keywords:
Status: NEW
Alias: CVE-2026-4438
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2450226 2450227 2450229 2450231 2450233 2450235
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-20 21:02 UTC by OSIDB Bzimport
Modified: 2026-05-29 09:33 UTC (History)
7 users (show)

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

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:21155 0 None None None 2026-05-26 21:42:58 UTC
Red Hat Product Errata RHBA-2026:21156 0 None None None 2026-05-26 21:54:51 UTC
Red Hat Product Errata RHBA-2026:21321 0 None None None 2026-05-27 13:03:26 UTC
Red Hat Product Errata RHBA-2026:21324 0 None None None 2026-05-27 15:20:18 UTC
Red Hat Product Errata RHBA-2026:21455 0 None None None 2026-05-27 21:11:44 UTC
Red Hat Product Errata RHBA-2026:21738 0 None None None 2026-05-28 11:14:11 UTC
Red Hat Product Errata RHSA-2026:19061 0 None None None 2026-05-19 13:07:20 UTC
Red Hat Product Errata RHSA-2026:20597 0 None None None 2026-05-26 08:53:45 UTC

Description OSIDB Bzimport 2026-03-20 21:02:39 UTC 
Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.
Comment 3 errata-xmlrpc 2026-05-19 13:07:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19061 https://access.redhat.com/errata/RHSA-2026:19061
Comment 4 errata-xmlrpc 2026-05-26 08:53:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:20597 https://access.redhat.com/errata/RHSA-2026:20597
Note You need to log in before you can comment on or make changes to this bug.