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Insufficient Session Expiration The advisory has been revoked - it doesn't affect any version of package unbound  (opens in a new tab)

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EPSS
1.16% (67th percentile)

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  • Snyk IDSNYK-RHEL9-UNBOUND-11451369
  • published5 Aug 2025
  • disclosed1 Aug 2022
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Introduced: 1 Aug 2022

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

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound package and not the unbound package as distributed by RHEL.

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.

References