CVE-2026-42955

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-98124 In the Linux kernel, the following vulnerability has been resolved: smb/client… CWE-672
• CVE-2026-98080 In the Linux kernel, the following vulnerability has been resolved: btrfs: do not force… CWE-672
• CVE-2026-55250 Maravel, a PHP framework oriented towards dependency injection, prior to version 10.74.0… CWE-672
• CVE-2026-53637 Sylius is an Open Source eCommerce Framework on Symfony. CWE-672
• CVE-2026-61699 nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. CWE-672
• CVE-2026-85044 Use of released resource in Mobile in Google Chrome on on Android prior to 152.0.7977.82… CWE-672
• CVE-2026-19538 The BLOCKED access control list items that are evaluated to deny access on the the proxy… CWE-672
• CVE-2026-79010 Operation on a resource after expiration or release in Network in Google Chrome prior to… CWE-672