CVE-2026-42944

high Red Hat
CVSS v3 Base Score
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.0%
Exploitation probability in 30 days
Top 87% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: May 20, 2026 (50 days ago)
Last Modified: May 20, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in Unbound, a Domain Name System (DNS) resolver. A remote attacker could trigger a heap overflow by sending specially crafted DNS reply packets. This occurs when Unbound attempts to encode multiple Name Server Identifier (NSID) or Extension Mechanisms for DNS (EDNS) Cookie options, or EDNS Padding options, and these options are enabled. Successful exploitation of this vulnerability could lead to a denial of service (DoS), making the Unbound service unavailable.

Affected Products

Red Hat Enterprise Linux 10Red Hat Enterprise Linux 6Red Hat Enterprise Linux 7Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9Red Hat Hardened ImagesRed Hat OpenShift Container Platform 4

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov