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CVE-2026-62878 is a critical remote code execution vulnerability in Windows DNS Server caused by a stack-based buffer overflow. A remote unauthenticated attacker can send a specially crafted packet to a vulnerable DNS service to trigger the flaw. The issue affects Windows Server 2019, Windows Server 2022, and Windows Server 2025 systems with the DNS Server role installed. Exploitation requires neither credentials nor user interaction and has been characterized as technically wormable.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This two-file repository contains a README and a standalone Python 3 proof of concept, exp.py. It targets the claimed CVE-2026-62878 Windows DNS Server stack-buffer-overflow condition. The script builds DNS wire-format A/IN queries with randomized transaction IDs and unique four-byte labels beginning with a NUL byte, then sends them over UDP to a user-selected target. It tracks responses and treats 60 consecutive timeouts after initial successful answers as a possible DNS-service failure. Diagnostic output identifies NTree_CreateHashAtNode and a stack-cookie failure path as the expected crash mechanism. The repository explicitly states that it has reproduced remote denial of service only and that RCE research is ongoing; no shell, command execution, persistence, credential access, or customizable code-execution payload is present.
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25 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical stack-based buffer-overflow vulnerability permitting remote code execution in Windows DNS Server.
A critical, unauthenticated remote code execution vulnerability in Windows DNS Server caused by a stack-based buffer overflow. A single specially crafted network packet can potentially enable code execution without credentials, privileges, or user interaction.
A Critical-severity remote code execution vulnerability in Windows DNS Server. The content says it requires neither authentication nor user interaction.
A critical stack-based buffer overflow vulnerability in Windows DNS Server that requires no authentication or user interaction and may be wormable.
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.