CVE-2026-41292 — Long list of incoming EDNS options degrades performance
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 sendi…
Published: 2026-05-20 · CVSS: 6.6 · CVSS 4.0
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).
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7