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CVE-2026-50020 is an HTTP request smuggling vulnerability in Netty's HTTP codec module affecting versions prior to 4.1.135.Final and 4.2.15.Final. The flaw resides in HttpObjectDecoder, specifically in logic that skips leading bytes before parsing the first HTTP request-line. Instead of only tolerating empty CRLF lines as permitted by RFC 9112, the decoder silently consumes arbitrary ISO control characters in the 0x00-0x1F range and 0x7F, along with whitespace. This overly permissive preprocessing can cause Netty to interpret the start of a request differently from an upstream reverse proxy, load balancer, or web application firewall that does not ignore the same bytes. In deployments that reuse persistent backend connections, this parser discrepancy can create request-boundary confusion and enable HTTP desynchronization or request smuggling against applications using netty-codec-http.
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An HTTP request smuggling vulnerability in Netty's HTTP codec module (HttpObjectDecoder) caused by inconsistent handling of leading control characters, allowing attackers to bypass front-end proxy or WAF controls in architectures where persistent backend TCP connections are reused.
A Netty HTTP request smuggling vulnerability in HttpObjectDecoder caused by inconsistent parsing of control characters before the request line.
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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.