High severity7.5NVD Advisory· Published May 20, 2026· Updated May 20, 2026
CVE-2026-41292
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).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
16- osv-coords13 versionspkg:rpm/opensuse/unbound&distro=openSUSE%20Tumbleweedpkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/unbound&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/unbound&distro=SUSE%20Linux%20Micro%206.2
< 1.25.1-1.1+ 12 more
- (no CPE)range: < 1.25.1-1.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.24.1-160000.2.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.20.0-150100.10.25.1
- (no CPE)range: < 1.24.1-160000.2.1
- (no CPE)range: < 1.24.1-160000.2.1
Patches
Vulnerability mechanics
References
1- www.nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txtnvdMitigationVendor Advisory
News mentions
1- NLnet Labs Unbound: 11 CVEs Disclosed in Single Advisory — Two Critical Including Cache PoisoningVypr Intelligence · May 20, 2026