CVE-2026-42587

7.5 HIGH

Netty is an asynchronous, event-driven network application framework

Published: 2026-05-13 · Last updated: 2026-05-18

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-400

Affected products

Vendor	Product
netty	netty

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

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-42587
[Vendor advisory]https://github.com/netty/netty/security/advisories/GHSA-f6hv-jmp6-3vwv
[Vendor advisory]https://github.com/netty/netty/security/advisories/GHSA-f6hv-jmp6-3vwv

Related CVEs

Same vendor

CVE-2026-48040 — The netty incubator codec.bhttp is a java language binary http parser (9.1 CRITICAL)
CVE-2026-41207 — The netty incubator codec.bhttp is a java language binary http parser (5.3 MEDIUM)
CVE-2026-44248 — Netty is an asynchronous, event-driven network application framework (5.3 MEDIUM)
CVE-2026-42586 — Netty is an asynchronous, event-driven network application framework (6.8 MEDIUM)
CVE-2026-42585 — Netty is an asynchronous, event-driven network application framework (6.5 MEDIUM)

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