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CVE-2026-42584

⚠️ 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, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS Score
7.3
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 55.5% of all 325,703 vulnerabilities in our database.

#144,873
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:L/I:L/A:L
CWE IDs (Weakness Types)
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-2026-42577 ⚠️ 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-2026-42580 🔶 medium 6.5 0.0 Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's c... 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
These CVEs affect the same products