CVE-2026-41292

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).

References

https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txt

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41292.json

https://bugzilla.redhat.com/show_bug.cgi?id=2480125

https://access.redhat.com/security/cve/CVE-2026-41292

https://access.redhat.com/errata/RHSA-2026:37282

https://access.redhat.com/errata/RHSA-2026:36777

https://access.redhat.com/errata/RHSA-2026:36320

https://access.redhat.com/errata/RHSA-2026:24013

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS