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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 325,680 vulnerabilities in our database.

#169,892
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)

📦 Affected Products 2

🔗 References 1

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-42577 ⚠️ high 7.5 0.1 Netty is an asynchronous, event-driven network application framework. From 4.2.0.Final to 4.2.13.Final , Netty's epoll t... 2026-05-13
CVE-2026-42578 ⚠️ high 7.5 0.0 Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's H... 2026-05-13
CVE-2026-42579 ⚠️ high 7.5 0.0 Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's D... 2026-05-13
CVE-2026-42581 🔶 medium 5.8 0.0 Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjec... 2026-05-13
CVE-2026-42582 ⚠️ high 7.5 0.0 Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final, when decoding header blocks... 2026-05-13
CVE-2026-42583 ⚠️ high 7.5 0.0 Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameD... 2026-05-13
These CVEs affect the same products