[GHSA-w4f7-4cxr-rv3c] cowboy and gun affected by an HTTP Request/Response Splitting vulnerability - #8906
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July 31, 2026 02:40
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The patched version listed for the gun (Hex) package appears to be incorrect: it reads 2.16.0, which is cowboy's fixed version. Gun has never released a 2.16.0 (the latest is 2.5.0), so the range resolves to "all published versions are affected."
This advisory's own reference for the gun-side fix is ninenines/gun@4f35609 ("Add invalid_request_headers request option", 2026-05-29). That commit is contained in tags 2.4.0, 2.4.1 and 2.5.0 (
git tag --contains 4f35609against ninenines/gun), and 2.4.0 was tagged on 2026-06-08. Gun rejects CR/LF in request header values by default from 2.4.0 onward —invalid_request_headersdefaults toraise, applied ingun:request/6,headers/5,connect/4and bothws_upgradearities.The consequence of the current data is that
mix hex.auditreports this advisory against every gun version, including releases that contain the referenced fix. Please set gun's patched version to 2.4.0 and its affected range to < 2.4.0.