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Vendor Solution
This issue is fixed starting with version 1.25.2
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Wed, 22 Jul 2026 15:30:00 +0000
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Wed, 22 Jul 2026 13:30:00 +0000
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| Description | In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the 'ghost domain names' family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records. Similar to other 'ghost domain names' attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client A/AAAA query can cause Unbound to overwrite the cached expired parent-side glue rrset and essentially extend the ghost domain window by up to one cached TTL configured value ('cache-max-ttl'). In configurations where 'harden-referral-path: yes' is used (non-default configuration), no client query is required since Unbound implicitly performs that query. This is a variant of CVE-2026-40622 which only addressed the NS query. | |
| Title | Extra fix for CVE-2026-40622 to also clamp the TTL of A/AAAA records disallowing a one-time 'ghost domain' delegation renewal via glue records | |
| Weaknesses | CWE-672 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: NLnet Labs
Published:
Updated: 2026-07-22T14:26:48.806Z
Reserved: 2026-06-22T10:11:10.510Z
Link: CVE-2026-42955
Updated: 2026-07-22T14:26:43.752Z
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