MEDIUMCVSS v3.1 6.5Vulnerability
CVE-2026-50106
When NLnet Labs Unbound up to and including version 1.26.1 is configured with both a root trust anchor and an additional 'trust-anchor:' for an island-of-security zone whose parent is provably insecure under the root chain, a malicious actor who can deliver one forged NXDOMAIN response for a name inside the island, with the NSEC/SOA RRSIG 'SignerName' set to the insecure parent, tricks Unbound's validator to use the root trust anchor instead, and consecutively the insecure parent, thus causing that record to be treated as insecure and denying existence for records in the trust island.
Properties
- Severity
- MEDIUM
- Nvd fetched at
- 2026-10-22T22:14:18.200859+00:00
- Epss score
- 0.00194
- Cvss severity
- MEDIUM
- Cvss score
- 6.5
- Retrieved at
- 2026-10-22T22:17:34+00:00
- Last source
- FIRST EPSS
- Score
- 6.5
- Cvss version
- 3.1
- Cve id
- CVE-2026-50106
- Cvss vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
- First seen by Signal
- 2026-10-21T22:34:38+00:00
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
- Published at
- 2026-10-21T09:17:07.497
- Last modified
- 2026-10-22T15:22:40.700
- Epss percentile
- 0.08589
Related Entities (1)
HAS_WEAKNESS (1)
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