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CVE-2026-21232 is an elevation-of-privilege vulnerability in Windows HTTP.sys caused by an untrusted pointer dereference. The flaw affects the Windows kernel-mode HTTP protocol stack and can be triggered by an authorized local attacker. By causing HTTP.sys to dereference a pointer derived from untrusted input, an attacker may be able to corrupt execution flow or access privileged kernel context, resulting in local privilege escalation on affected Windows systems.
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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.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A privilege escalation vulnerability affecting Windows HTTP.sys.
A vulnerability affecting Windows HTTP.sys; specific impact type not provided in the content.
An elevation of privilege vulnerability in Windows HTTP.sys (no additional details provided in the content).
An elevation of privilege vulnerability in Windows HTTP.sys.
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.