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CVE-2026-42580

🔶 medium
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Summary

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS Score
6.5
Medium
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-13
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 47.8% of all 328,009 vulnerabilities in our database.

#171,192
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 14, 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:L/A:L
CWE IDs (Weakness Types)
CWE-190 CWE-444

📦 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 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