CVE-2026-42960

medium Red Hat
CVSS v3 Base Score
5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS Score
0.0%
Exploitation probability in 30 days
Top 92% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
High
Availability
None
Published: May 20, 2026 (51 days ago)
Last Modified: May 20, 2026
Vendor: Red Hat
Fix Available: ✓ Yes
Source: REDHAT

Description

A flaw was found in Unbound's handling of DNS reply messages, complementing the earlier CVE-2025-11411 fix. Unbound accepts and caches address records from the additional section of DNS replies when they accompany authority section RRSets other than NS (such as MX records). A malicious actor who can inject crafted DNS responses—via packet spoofing or fragmentation attacks—can exploit this to poison Unbound's cache with attacker-controlled address records, potentially redirecting DNS resolution for affected domains.

CWE

CWE-349

Affected Products

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

Fix Status

✅ Fix Available

References

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