CVE-2026-50011: high-severity vulnerability in netty
Netty has unbounded pre-allocation in RedisArrayAggregator from RESP array length
Published · Updated
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.5epss 0.8%
from disclosure to weapon34 days
Published on NVDJun 12
1st PoC+34d
exploitation probability
0.8%top 43% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, RedisArrayAggregator pre-allocates ArrayList with initial capacity equal to the RESP array element count declared in an array header. That count is taken from the wire before the corresponding child messages exist. A small malicious header can claim a huge initial capacity. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
netty · nettypublic PoCs found — 2
githubgithub.com/bibotai/secveri-cve-2026-50011-positive★ 0githubgithub.com/bibotai/secveri-cve-2026-50011-negative★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — netty
In the same product, most dangerous first.
CVE-2021-21409MEDIUMPossible request smuggling in HTTP/2 due missing validation of content-lengthEPSS 4.9%CVE-2021-43797MEDIUMHTTP fails to validate against control chars in header names which may lead to HTTP request smugglingEPSS 2.9%CVE-2023-34462MEDIUMnetty-handler SniHandler 16MB allocationEPSS 2.5%CVE-2025-24970HIGHSslHandler doesn't correctly validate packets which can lead to native crash when using native SSLEngineEPSS 2.2%CVE-2021-21290MEDIUMLocal Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary filesEPSS 1.8%CVE-2022-41881MEDIUMCVE-2022-41881EPSS 1.6%
References
https://access.redhat.com/errata/RHSA-2026:37390https://access.redhat.com/errata/RHSA-2026:41951https://access.redhat.com/errata/RHSA-2026:50085https://access.redhat.com/errata/RHSA-2026:53644https://access.redhat.com/errata/RHSA-2026:53645https://access.redhat.com/errata/RHSA-2026:53646https://access.redhat.com/security/cve/CVE-2026-50011https://bugzilla.redhat.com/show_bug.cgi?id=2488413https://github.com/netty/netty/releases/tag/netty-4.1.135.Finalhttps://github.com/netty/netty/releases/tag/netty-4.2.15.Finalhttps://github.com/netty/netty/security/advisories/GHSA-5w86-c3rq-vjj7https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50011.json