Loading vulnerability…
CVE-2026-42955 is a low-severity variant of the ghost domain names attack family affecting NLnet Labs Unbound from 1.16.2 through 1.25.1 inclusive. The flaw is related to the earlier CVE-2026-40622 fix and arises because cached parent-side A and AAAA glue rrsets can have their effective ghost-domain lifetime renewed once when processed by a vulnerable resolver. A single client query for A or AAAA data can cause Unbound to overwrite an expired cached parent-side glue rrset and thereby extend the ghost domain window by as much as the configured maximum cache TTL value. In deployments using the non-default setting harden-referral-path: yes, Unbound can perform the necessary query implicitly, removing the need for a separate client-triggered query. The issue was fixed by additionally clamping the TTL of A and AAAA glue records so they cannot be used for a one-time delegation renewal.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.