GHSA-hh82-3pmq-7frp Netty vulnerable to HTTP Response splitting from assigning header value iterator

• Maven io.netty:netty-codec-http: >= 4.1.83.Final, < 4.1.86.Final → fixed in 4.1.86.Final

Impact When calling `DefaultHttpHeaders.set` with an _iterator_ of values (as opposed to a single given value), header value validation was not performed, allowing malicious header values in the iterator to perform HTTP Response Splitting. Patches The necessary validation was added in Netty 4.1.86.Final. Workarounds Integrators can work around the issue by changing the `DefaultHttpHeaders.set(CharSequence, Iterator)` call, into a `remove()` call, and call `add()` in a loop over the iterator of values. References HTTP Response Splitting CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers For more information If you have any questions or comments about this advisory: • Open an issue in [example link to repo](https://github.com/netty/netty) • Email us at [email protected]