CVE-2026-42587— Netty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy enables decompression bomb DoS
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I. Basic Information for CVE-2026-42587
Vulnerability Information
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Vulnerability Title
Netty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy enables decompression bomb DoS
Source: NVD (National Vulnerability Database)
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpContentDecompressor accepts a maxAllocation parameter to limit decompression buffer size and prevent decompression bomb attacks. This limit is correctly enforced for gzip and deflate encodings via ZlibDecoder, but is silently ignored when the content encoding is br (Brotli), zstd, or snappy. An attacker can bypass the configured decompression limit by sending a compressed payload with Content-Encoding: br instead of Content-Encoding: gzip, causing unbounded memory allocation and out-of-memory denial of service. The same vulnerability exists in DelegatingDecompressorFrameListener for HTTP/2 connections. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Netty 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.2.13.Final和4.1.133.Final之前版本存在资源管理错误漏洞，该漏洞源于HttpContentDecompressor在br编码时忽略maxAllocation参数，可能导致无限制内存分配和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| netty | netty | >= 4.2.0.Alpha1, < 4.2.13.Final | - | |
| io.netty | netty-codec-http | >= 4.2.0.Alpha1, < 4.2.13.Final | - | |
| io.netty | netty-codec-http2 | >= 4.2.0.Alpha1, < 4.2.13.Final | - |
II. Public POCs for CVE-2026-42587
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|---|
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- https://github.com/netty/netty/security/advisories/GHSA-f6hv-jmp6-3vwvx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-42587
Same Patch Batch · netty · 2026-05-13 · 12 CVEs total
| CVE-2026-42582 | 7.5 HIGH | Netty: HTTP/3 QPACK literal unbounded allocation |
| CVE-2026-42579 | 7.5 HIGH | Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder) |
| CVE-2026-42583 | 7.5 HIGH | Netty: Lz4FrameDecoder resource exhaustion |
| CVE-2026-42577 | 7.5 HIGH | Netty: epoll transport denial of service via RST on half-closed TCP connection |
| CVE-2026-42584 | 7.3 HIGH | Netty: HttpClientCodec response desynchronization |
| CVE-2026-42586 | 6.8 MEDIUM | Netty: CRLF Injection in Netty Redis Codec Encoder |
| CVE-2026-42580 | 6.5 MEDIUM | Netty: HTTP Request Smuggling due to incorrect chunk size parsing |
| CVE-2026-42585 | 6.5 MEDIUM | Netty: HTTP Request Smuggling due to malformed Transfer-Encoding |
| CVE-2026-42581 | 5.8 MEDIUM | Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization |
| CVE-2026-44248 | 5.3 MEDIUM | Netty: Resource exhaustion in MqttDecoder |
| CVE-2026-42578 | Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation |
IV. Related Vulnerabilities
Same product: netty
- CVE-2026-44248
Netty: Resource exhaustion in MqttDecoder - CVE-2026-42586
Netty: CRLF Injection in Netty Redis Codec Encoder - CVE-2026-42585
Netty: HTTP Request Smuggling due to malformed Transfer-Enco - CVE-2026-42584
Netty: HttpClientCodec response desynchronization - CVE-2026-42583
Netty: Lz4FrameDecoder resource exhaustion
Same vendor: netty
- CVE-2026-44248
Netty: Resource exhaustion in MqttDecoder - CVE-2026-42586
Netty: CRLF Injection in Netty Redis Codec Encoder - CVE-2026-42585
Netty: HTTP Request Smuggling due to malformed Transfer-Enco - CVE-2026-42584
Netty: HttpClientCodec response desynchronization - CVE-2026-42583
Netty: Lz4FrameDecoder resource exhaustion
Same weakness: CWE-400
- CVE-2026-42304
Twisted: Denial of Service (DoS) in twisted.names via Crafte - CVE-2026-44248
Netty: Resource exhaustion in MqttDecoder - CVE-2026-42583
Netty: Lz4FrameDecoder resource exhaustion - CVE-2026-44456
Hono: bodyLimit() can be bypassed for chunked / unknown-leng - CVE-2026-44241
Micronaut Framework: Unbounded formattersCache in TimeConver
V. Comments for CVE-2026-42587
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