Insufficient Session Expiration Affecting unbound package, versions <1.16.2-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.87% (55th percentile)

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  • Snyk IDSNYK-ECHOLATEST-UNBOUND-18234956
  • published23 Jul 2026
  • disclosed1 Aug 2022

Introduced: 1 Aug 2022

CVE-2022-30698  (opens in a new tab)
CWE-613  (opens in a new tab)

How to fix?

Upgrade Echo:latest unbound to version 1.16.2-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound package and not the unbound package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.

CVSS Base Scores

version 3.1