Jan Stourac created WFLY-12305: ---------------------------------- Summary: HPACK decoding huffman-encoded string with EOS symbol Key: WFLY-12305 URL: https://issues.jboss.org/browse/WFLY-12305 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 17.0.1.Final Reporter: Jan Stourac Assignee: Flavia Rainone During the HTTP2 communication where HPACK is utilized, when client sends inappropriate huffman-encoded string containing EOS symbol, server side is supposed to respond with GOAWAY - compression error, although current implementation of Undertow simply continues and sends DATA frame instead. Relevant [RFC section|https://tools.ietf.org/html/rfc7541#section-5.2]. Note that this issue is probably present for long time in Undertow. Current test started to fail after recent fix in the test itself, [see here|https://github.com/summerwind/h2spec/commit/ce109b0cae4731610dbccded...]. {code:title=Test output} HPACK: Header Compression for HTTP/2 5. Primitive Type Representations 5.2. String Literal Representation × 3: Sends a Huffman-encoded string literal representation containing the EOS symbol -> The endpoint MUST treat this as a decoding error. Expected: GOAWAY Frame (Error Code: COMPRESSION_ERROR) Connection closed Actual: DATA Frame (length:1496, flags:0x01, stream_id:1) {code} -- This message was sent by Atlassian Jira (v7.12.1#712002)