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CVE-2026-42584

Netty: HttpClientCodec response desynchronization

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Io.netty Netty
Products
Netty-codec-http Netty
CVE-2026-42580

Netty: HTTP Request Smuggling due to incorrect chunk size parsing

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Io.netty Netty
Products
Netty-codec-http Netty
CVE-2026-42582

Netty: HTTP/3 QPACK literal unbounded allocation

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final, when decoding header blocks, the non-Huffman branch of io.netty.handler.codec.http3.QpackDecoder#decodeHuffmanEncodedLiteral may execute new byte[length] for a string literal before verifying that length bytes are actually present in the compressed field section. The wire encoding allows a very large length to be expressed in few bytes. There is no check that length <= in.readableBytes() before new byte[length]. This vulnerability is fixed in 4.2.13.Final.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Io.netty Netty
Products
Netty-codec-http3 Netty
CVE-2026-42585

Netty: HTTP Request Smuggling due to malformed Transfer-Encoding

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Io.netty Netty
Products
Netty-codec-http Netty