What’s Vulnerable › Vulnerabilities

CVE-2026-50011: Netty has unbounded pre-allocation in RedisArrayAggregator from RESP array length

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-09-18
• Weakness: CWE-400

Description

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.

Affected products

• netty: before 4.1.135; from 4.2.0 before 4.2.15 — fixed in 4.1.135, 4.2.15

How to fix

Upgrade to a fixed version: netty 4.1.135, 4.2.15. Check the vendor advisory for mitigations.

References

• https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
• https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
• https://github.com/netty/netty/security/advisories/GHSA-5w86-c3rq-vjj7
• https://access.redhat.com/errata/RHSA-2026:37390
• https://access.redhat.com/errata/RHSA-2026:41951
• https://access.redhat.com/errata/RHSA-2026:50085
• https://access.redhat.com/errata/RHSA-2026:53644
• https://access.redhat.com/errata/RHSA-2026:53645
• https://access.redhat.com/errata/RHSA-2026:53646
• https://access.redhat.com/security/cve/CVE-2026-50011
• https://bugzilla.redhat.com/show_bug.cgi?id=2488413
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50011.json

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