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CVE-2026-50248

MEDIUM
6.5
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-50248
State
PUBLISHED
Assigner
NLnet Labs
Reserved
2026-06-22 10:11 UTC
Published
2026-07-22 13:08 UTC
Last updated
2026-07-22 13:08 UTC
Primary CWE
CWE-345
CWE-345: Insufficient Verification of Data Authenticity
Vendor / Product
NLnet Labs / Unbound
Sources
cve.org  ·  NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
Affected products (1)
VendorProductPlatformVersions
NLnet Labs Unbound — 1.7.0 < 1.25.2
Weakness (CWE)
CWESourceDescription
CWE-345 cna CWE-345: Insufficient Verification of Data Authenticity
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.5 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
References (1)
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