CVE-2026-50011
Description
A flaw was found in Netty, a network application framework. The RedisArrayAggregator component pre-allocates memory based on the declared element count in a Redis array header. A remote attacker can exploit this by sending a small, malicious Redis array header that claims a huge initial capacity, leading to excessive memory pre-allocation. This can result in a denial of service (DoS) due to resource exhaustion.
Statement
This is an Important denial of service vulnerability in Netty's RedisArrayAggregator component. A remote, unauthenticated attacker can exploit this flaw by sending a specially crafted Redis array header, causing excessive memory pre-allocation and leading to resource exhaustion. This can disrupt services utilizing Netty for Redis communication.
Mitigation
To mitigate this issue, restrict network access to services that utilize the netty-codec-redis component and process Redis traffic. Configure firewalls or network access control lists (ACLs) to limit connections to these services from trusted networks or localhost only. This reduces the attack surface by preventing untrusted remote attackers from sending malicious Redis array headers. Consult product-specific documentation for detailed instructions on configuring network access for affected Red Hat products. Reloading or restarting services may be required for network configuration changes to take effect, which could temporarily impact availability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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