CVE-2026-42000
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
Insufficient validation of names during AXFR (DNS zone transfer) may allow an attacker to inject malicious or malformed data.
Risk Assessment
An attacker could exploit this to perform unauthorized zone transfers, exposing sensitive domain information.
Recommendation
Update DNS software to a version that properly validates names during AXFR. Restrict zone transfer access to trusted secondary servers only.
Other vulnerabilities in DNS server
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A use-after-free vulnerability in the DNS Server component in Microsoft Windows Server 2012 Gold and R2 allows remote attackers to execute arbitrary code via crafted requests.
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Use after free in DNS Server allows an unauthorized attacker to execute code over a network.
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Concurrent execution using shared resource with improper synchronization ('race condition') in DNS Server allows an unauthorized attacker to execute code over a network.
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Race condition in DNS Server allows an unauthorized attacker to execute code over a network.
- CVE-2026-50426Medium
Relative path traversal vulnerability in DNS Server allows an authorized attacker to execute code over an adjacent network.
- CVE-2026-49169High
Use-After-Free vulnerability in DNS Server allows an authorized attacker to execute code remotely over the network. The issue stems from improper memory management when processing specially crafted DNS queries.
Original NVD description (English source)
Insufficient Validation of Names During AXFR