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CVE-2026-42587

⚠️ high
🔍 Scan for this CVE
Summary

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 wi

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.

CVSS Score
7.5
High
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-13
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 68.9% of all 330,193 vulnerabilities in our database.

#102,656
Above average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 13, 2026
🔍 Exploitation Status
Poc
Proof-of-concept available
⚙️ Automatable
YES
Can be exploited automatically
💥 Technical Impact
Partial
Limited system impact
SSVC data provided by CISA
Last Modified 2026-05-18
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE IDs (Weakness Types)
CWE-400

📦 Affected Products 2

Vendor Product Status Affected Versions
netty netty Affected
< 4.1.133
netty netty Affected
> 4.2.0 < 4.2.13

🔗 References 1

https://github.com/netty/netty/security/advisories/G...
Exploit Mitigation Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-44892 ⚠️ high 7.5 0.5 Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final,... 2026-06-12
CVE-2026-44893 ⚠️ high 7.5 0.6 Netty is a network application framework for development of protocol servers and clients. In netty-codec-haproxy prior t... 2026-06-12
CVE-2026-44894 ⚠️ high 7.5 0.2 Netty is a network application framework for development of protocol servers and clients. NoQuicTokenHandler is the toke... 2026-06-12
CVE-2026-45416 ⚠️ high 7.5 0.6 Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Fina... 2026-06-12
CVE-2026-45536 🔶 medium 4.0 0.2 Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Fina... 2026-06-12
CVE-2026-45673 🔶 medium 6.8 0.4 Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Fina... 2026-06-12
These CVEs affect the same products