CVE•Published 2026-05-20•Modified 2026-05-20•0 articles on news•6 live references•NVD data

CVE-2026-41292Nlnetlabs · Unbound

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

—

Weaknesses (CWE)

CWE-407Inefficient Algorithmic Complexity CWE-770Allocation of Resources Without Limits or Throttling

Description

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).

Timeline

Published 2026-05-20

Modified 2026-05-20

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

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-2026-41292

Hosts 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-2026-41292