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CVE-2026-28975 affects swift-nio-extras in the NIOHTTPRequestDecompressor component. When decompression protection is configured using the .ratio(N) limit, the implementation can be bypassed by an attacker supplying a falsified inflated Content-Length header. The vulnerable logic relies on the header-supplied Content-Length value when enforcing the decompression ratio limit, rather than tracking the actual compressed bytes received. As a result, a highly compressed request body can be accepted and decompressed without the intended protection being applied.
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