CVE-2026-42584High· 7.3▾ MidnightPoC availableNetty 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 …
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 40.2 · likelihood 0.2 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Jul 10.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.7%
Exploit / PoC code exists
Last analysed / modified upstream
0.7% → 0.8%
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.
netty < 4.1.133netty >= 4.2.0, < 4.2.13Upgrade past the affected range:
netty 4.2.13Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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