Web Hack List

Other nomination

Cache Key Normalization Denial of Service

A cache that normalises part of the key while forwarding the request untouched can be poisoned with one request. Capitalising the Host header, or altering a path segment the cache collapses, makes the origin return a 404 that is stored under the legitimate key and served to everyone, taking a site assets host offline; an unkeyed Accept-Version header does the same.

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