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CVE-2026-20929 is an improper access-control vulnerability in Windows HTTP.sys affecting protections against Kerberos authentication relay. Windows Kerberos clients can use a DNS CNAME alias when constructing the service principal name for a service-ticket request. An attacker able to manipulate a victim's DNS resolution can cause the victim to obtain a Kerberos ticket for an attacker-selected service principal name and present it to attacker-controlled infrastructure. The ticket can then be relayed to an HTTP service that does not enforce channel binding token protection. January 2026 Windows security updates added and backported channel binding token support in HTTP.sys to protect affected HTTP-based services; the DNS CNAME-to-SPN behavior itself remains unchanged.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An IPv6 Router Advertisement/RDNSS DNS-takeover coercion issue in which an attacker-controlled recursive DNS server can be advertised to a victim client with an indefinite RDNSS lifetime. The referenced cleanup fix sends a zero-lifetime withdrawal Router Advertisement so coerced clients stop using the rogue DNS resolver after the module ends.
An ESC8-related Active Directory Certificate Services Web Enrollment issue referenced in the context of a native Kerberos relay workflow and Metasploit target development.
A vulnerability identified as CVE-2026-20929 involving Kerberos relay via DNS/DHCPv6-based DNS takeover coercion, enabling an attacker to position themselves as the victim's DNS server and facilitate Kerberos relay and related abuse.
A Kerberos relay via DNS technique in which attacker-controlled IPv6 DHCPv6 or Router Advertisement DNS takeover/coercion is used to position the attacker as the victim's DNS server and enable relay activity, including DNS CNAME abuse.
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.