cve-2026-42587

HIGH CVSS 7.5 nvd
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.

Timeline
Published
2026-05-13
Last Modified
2026-09-18
CVSS Details
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
Affected Products
  • netty netty
Weaknesses (CWE)
CVSS metrics
Version Base Severity Vector Exploitability Impact Source
3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 3.9 3.6 security-advisories@github.com
3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 3.9 3.6 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
CPE configurations
OR
CPE Version range Vulnerable
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* < 4.1.133 yes
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* >= 4.2.0, < 4.2.13 yes
NVD metadata
NVD status
Modified
Source identifier
security-advisories@github.com
References
Linked Vulnerabilities

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  "datePublished": "2026-05-13T19:17:24.460",
  "dateUpdated": "2026-09-18T13:18:21.533",
  "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.",
  "id": "CVE-2026-42587",
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