CVE-2026-50011 netty CVE debrief

Who should care

Defenders and developers using Netty for network application development should assess exposure and apply patches or mitigations as necessary. They should verify Netty versions in their environment, review and update inventory to ensure affected versions are identified and mitigated, and monitor for potential resource exhaustion. Security teams and vulnerability management teams should prioritize patching or mitigation, especially in environments using Net

Why it matters

CVE-2026-50011 is a high-severity vulnerability in Netty's RedisArrayAggregator that can lead to resource exhaustion. Defenders and developers using Netty should assess exposure, apply patches or mitigations, and verify Netty versions in their environment.

• Potential resource exhaustion due to pre-allocation of large ArrayList
• Possible denial of service (DoS) through exploitation of this vulnerability
• Need for patching or mitigation to prevent potential resource exhaustion
• Verification of Netty versions and exposure in the environment is necessary

Technical summary

The RedisArrayAggregator in Netty pre-allocates an ArrayList with an initial capacity equal to the RESP array element count declared in an array header. A small malicious header can claim a huge initial capacity, potentially leading to resource exhaustion. This issue is patched in Netty versions 4.1.135.Final and 4.2.15.Final. Defenders should assess exposure and apply patches or mitigations as necessary. The vulnerability affects versions prior to 4.1.135.Final and 4.2.15.Final, and defenders should verify Netty versions in their environment.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments using Netty for network application development.

Recommended defensive actions

• Assess exposure and apply patches for Netty versions prior to 4.1.135.Final and 4.2.15.Final
• Review and update inventory to ensure affected versions are identified and mitigated
• Monitor for potential resource exhaustion and implement compensating controls if patching is not feasible
• Verify Netty versions in the environment and prioritize patching or mitigation
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, while release notes and vendor advisories offer patches and mitigation strategies. Defenders should verify Netty versions in their environment, assess exposure, and apply patches or mitigations as necessary. The issue is patched in Netty versions 4.1.135.Final and 4.2.15.Final. Evidence from the CVE record and NVD detail page indicates a high-severity vulnerability in Netty's RedisArrayAggregator that can lead to resource exhaustion.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.