CVE•Published 2026-07-22•Modified 2026-07-24•0 articles on news•5 live references•NVD data
CVE-2026-50248Nlnetlabs · Unbound
Vulnerability data via NVD (ingested)
CVSS v3.1
6.5
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
EPSS percentile
—
Weaknesses (CWE)
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.
Timeline
Published 2026-07-22
Modified 2026-07-24
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-50248Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Nlnetlabs Unbound"All exposed Nlnetlabs Unbound instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Unbound"HTTP body or banner mentions "Unbound" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-50248Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-50248Censys host search filtered to this CVE id.
grep.app
CVE-2026-50248Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-50248GitHub code search for direct mentions.
Google dork
"CVE-2026-50248" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-50248 on GitHub.
We haven't classified any articles referencing CVE-2026-50248 yet. The external references above still apply.