CVE•Published 2026-08-26•Modified 2026-09-08•0 articles on news•4 live references•NVD data
CVE-2026-19401Nlnetlabs · Nsd
Vulnerability data via NVD (ingested)
CVSS v3.1
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS percentile
26
Exploit Prediction Scoring System · top 74% of all CVEs
Description
Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options (17 when UDP payload size is 512). By continuously crashing the serve childs, the remote client can severely hamper or, when positioned sufficiently close, deny all DNS service.
Timeline
Published 2026-08-26
Modified 2026-09-08
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-2026-19401Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Nlnetlabs Nsd"All exposed Nlnetlabs Nsd instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Nsd"HTTP body or banner mentions "Nsd" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-19401Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-19401Censys host search filtered to this CVE id.
grep.app
CVE-2026-19401Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-19401GitHub code search for direct mentions.
Google dork
"CVE-2026-19401" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-19401 on GitHub.
We haven't classified any articles referencing CVE-2026-19401 yet. The external references above still apply.