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CVE-2025-58056 is an HTTP request smuggling vulnerability in Netty's netty-codec-http component affecting version 4.1.124.Final and versions 4.2.0.Alpha3 through 4.2.4.Final. The HTTP/1.1 chunked-message parser accepts a standalone line feed (LF) as a chunk-size line terminator instead of requiring carriage return followed by line feed (CRLF). When a reverse proxy treats that LF as part of a chunk extension and forwards it without normalization, a crafted message can be interpreted as one request by the proxy but two requests by Netty. This parsing discrepancy enables request smuggling, potentially bypassing front-end access controls and corrupting responses delivered to other clients.
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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.
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24 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.