Vulnerability Report

CVE-2026-50248

Title: DNS Policy Bypass / Zone Takeover

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-50248.

CWE Category CWE-345

Published Date Jul 22, 2026

Modified Date Jul 24, 2026

Exploit Status Not Found

Score 6.5 CVSS v3.1

Exploit Probability (EPSS)

0.13%

Vulnerability Summary

CVE-2026-50248: In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record (no valid RRSIG required) becomes the zone's XFR primary and can replaces the entire zone/the resolver's entire response policy.

Impacted Vendors

nlnetlabs 1

fedoraproject 1

Reference Links

https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50248.txt

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-50248 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

July 24, 2026 MODIFIED

Vulnerability data updated via NVD.

July 22, 2026 MODIFIED

Vulnerability data updated via NVD.

July 22, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L

Affected Stack

No specific products linked.