Withdrawn by the publisher.

Affected: CleanStart: apache-zookeeper

Multiple security vulnerabilities affect the apache-zookeeper package. These issues are resolved in later releases. See references for individual vulnerability details.

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Affected: Maven: io.netty:netty-codec-compression, Maven: io.netty:netty-codec

### Summary Lz4FrameDecoder allocates a ByteBuf of size `decompressedLength` (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus `compressedLength` payload bytes - 22 bytes if `compressedLength == 1` - to force that allocation.

### Details io.netty.handler.codec.compression.Lz4FrameDecoder#decode Header fields are trusted for sizing. On the compressed path, after `readableBytes >= compressedLength`, the decoder does `ctx.alloc().buffer(decompressedLength, decompressedLength)` then decompresses.

### PoC The test below demonstrates how an attacker sending 22 bytes will force the server to allocate 32MB

```java @Test void test() throws Exception { EventLoopGroup workerGroup = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory()); try { AtomicReference<Throwable> serverError = new AtomicReference<>(); CountDownLatch latch = new CountDownLatch(1);

ServerBootstrap server = new ServerBootstrap() .group(workerGroup) .channel(NioServerSocketChannel.class) .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel ch) { ch.pipeline() .addLast(new Lz4FrameDecoder()) .addLast(new ChannelInboundHandlerAdapter() {…

netty-4.1.133-1.1 on GA media

jose4j: jose4j: Denial of Service via malicious JSON Web Encryption (JWE) token compression lodash: prototype pollution in _.unset and _.omit functions netty-codec-http: Netty is vulnerable to request smuggling due to incorrect parsing of chunk extensions io.vertx/vertx-core: static handler component cache can be manipulated to deny the access to static files lodash: lodash: Arbitrary code execution via untrusted input in template imports eclipse-vertx/vert.x: eclipse-vertx/vert.x: Denial of Service via TLS handshake with wildcard server name react-server-dom-webpack: react-server-dom-parcel: reactreact-server-dom-turbopack: React Server Components: Denial of Service via specially crafted HTTP requests Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers or clients via reverse DNS spoofing Apache ZooKeeper: Apache ZooKeeper: Information disclosure via improper handling of configuration values next.js: Next.js: Unbounded next/image disk cache growth can exhaust storage io.netty/netty-codec-http: Netty: Request smuggling via incorrect parsing of HTTP/1.1 chunked transfer encoding extension values netty: Netty: Denial of Service via HTTP/2 CONTINUATION frame flood org.apache.logging.log4j/log4j-core: Apache Log4j Core: Invalid XML output causes denial of service in logging io.quarkus:quarkus-vertx-http: io.quarkus:quarkus-vertx-http: Authorization bypass via semicolons in HTTP requests DOMPurify: DOMPurify: Cross-Site Scripting (XSS) via inconsistent tag sanitization ax…

Withdrawn by the publisher.

Affected: Ubuntu:Pro:14.04:LTS: netty, Ubuntu:Pro:16.04:LTS: netty, Ubuntu:Pro:18.04:LTS: netty, Ubuntu:Pro:20.04:LTS: netty, Ubuntu:Pro:22.04:LTS: netty, Ubuntu:Pro:24.04:LTS: netty, Ubuntu:25.10: netty, Ubuntu:Pro:26.04:LTS: netty

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Netty ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.