Improper Handling of Highly Compressed Data (Data Amplification) Affecting io.netty:netty-codec-compression package, versions [,4.2.13.Final)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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- published7 May 2026
- disclosed7 May 2026
- creditoffset
Introduced: 7 May 2026
NewCVE-2026-42587 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-compression to version 4.2.13.Final or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data (Data Amplification) in the HttpContentDecompressor and DelegatingDecompressorFrameListener components when the Content-Encoding header is set to br, zstd, or snappy. An attacker can exhaust system memory and cause a denial of service by sending a highly compressed payload that decompresses to a very large size, bypassing the configured decompression limit.