The vulnerability of the `io.netty.handler.codec.http3.QpackDecoder` component in the Netty framework, which is used for developing network applications, servers, and clients. This vulnerability allows a attacker to cause a service failure.

The vulnerability of the io.netty.handler.codec.http3.QpackDecoder component in the Netty framework, which is used for developing network applications, servers, and clients, involves an uncontrolled resource consumption. Exploiting this vulnerability could allow a malicious actor to cause service...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in shouldWaitForDynamicTableUpdates in QpackDecoder. An attacker can open an indefinite number of persistently blocked streams by sending headers that reference dynamic table entries...

CVE-2026-42582

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.QpackDecoderdecodeHuffmanEncodedLiteral may execute new bytelength for a string literal before verifying that length byt...

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.QpackDecoderdecodeHuffmanEncodedLiteral may execute new bytelength for a string literal before verifying that length byt...

CVE-2026-42582

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.QpackDecoderdecodeHuffmanEncodedLiteral may execute new bytelength for a string literal before verifying that length byt...

Memory Allocation with Excessive Size Value

Overview Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value through the decodeHuffmanEncodedLiteral function in the QPACK decoder, which allocates memory for a byte array based on a length value received from the network without verifying that sufficie...