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CVE-2026-56746 is a security-control bypass in Netty CorsHandler affecting versions 4.1.0.Final through 4.1.135.Final and 4.2.0.Final through 4.2.15.Final. A logical operator error in origin evaluation allows requests containing an Origin: null header to bypass the shortCircuit() protection intended to reject unauthorized cross-origin requests before they reach application logic. Unauthorized requests are instead forwarded to the backend application. The vulnerability is fixed in Netty 4.1.136.Final and 4.2.16.Final.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Netty security-control bypass that permits unauthorized requests using a null Origin header.
Netty HTTP security-control bypass through a null Origin header.
A Netty HTTP security-control bypass allowing unauthorized requests through a null Origin header.
Security-control bypass in Netty that permits unauthorized requests with a null Origin header.
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.