CVE-2026-24514: Medium Vulnerability in ingress-nginx

A security issue was discovered in ingress-nginx where the validating admission controller feature is subject to a denial of service condition. By sending large requests to the validating admission controller, an attacker can cause memory consumption, which may result in the ingress-nginx controller pod being killed or the node running out of memory. The CVSS score for this vulnerability is 6.5, categorizing it as medium severity.

Risk to organizations includes potential service disruption as the ingress-nginx controller may be rendered inoperable under heavy load. With exploitation requiring low privileges and no user interaction, it is crucial for organizations to prioritize remediation efforts.

As of now, this vulnerability is awaiting analysis, but it is essential for defenders to remain vigilant. Organizations should prioritize patching immediately, especially considering the potential impact on service availability.

In terms of exploitation status, while public proofs of concept have been identified on GitHub, there are currently no known exploits in the wild. However, organizations are urged to keep monitoring this situation closely.

Given the potential for service disruption, organizations should address this vulnerability in their priority patch cycle.

Vulnerability Details

The vulnerability identified as CVE-2026-24514 specifically affects the ingress-nginx validating admission controller. The vulnerability allows for a denial of service due to excessive memory consumption when a large request is sent to the controller. The official CVSS score assigned is 6.5, indicating a medium level of severity.

The weakness is classified under CWE-770, which relates to insufficient resource management. This could lead to high availability impact as the ingress-nginx controller may become unresponsive.

The vulnerability was published on February 3, 2026, and remains under analysis.

Technical Analysis

The root cause of this vulnerability lies in the handling of requests by the validating admission controller in ingress-nginx. The attack vector is over the network, and the attack complexity is considered low, allowing attackers to exploit this vulnerability without significant effort.

The privileges required for exploitation are low, meaning that even users with minimal access can potentially trigger the vulnerability. Notably, no user interaction is required to execute the attack.

In terms of impact, the confidentiality and integrity of the system remain unaffected, while the availability impact is high, as the service may become unavailable under heavy load.

Risk & Impact Analysis

Organizations utilizing ingress-nginx should be aware of the denial of service condition that this vulnerability introduces. The risk of service disruption can have significant implications for operational continuity, especially for organizations that rely on ingress-nginx for routing traffic.

The potential blast radius could be extensive, affecting all services that depend on ingress-nginx for traffic management. Given the CVSS score of 6.5, organizations should assess their exposure and prioritize remediation efforts.

Considering the low EPSS score of 0.000170000 with a percentile of 0.039930000, the likelihood of exploitation is minimal at this point. However, organizations should not become complacent and must remain proactive in their security measures.

Exploitation Status

Affected Versions

All versions of ingress-nginx prior to the latest patch are potentially affected. Organizations should review their current versions and apply necessary updates to mitigate this vulnerability.

Mitigation & Remediation

To remediate this vulnerability, organizations should apply the latest patches provided by the ingress-nginx maintainers. It is crucial to regularly check for updates and apply them promptly to ensure security.

If immediate patching is not feasible, organizations should implement network controls to limit the size of requests sent to the validating admission controller. Additionally, monitoring resource consumption on the nodes can help identify potential abuse.

For further guidance on effective security measures, organizations can refer to our penetration testing services.

Detection Guidance

Organizations should monitor logs for indicators of large request patterns directed at the validating admission controller. Behavioral anomalies that could indicate attempts to exploit this vulnerability should also be investigated.

Additionally, network signatures can be developed to detect and block excessive request sizes that could lead to denial of service conditions.

AppSecure Threat Intelligence Insight

The long-term significance of CVE-2026-24514 lies in its demonstration of how resource mismanagement can lead to denial of service vulnerabilities in widely used components like ingress-nginx. Security teams should take this as a reminder to enforce strict resource limits and monitor usage.

This vulnerability highlights a pattern of increasing denial of service risks associated with Kubernetes components. Regular audits and proactive security measures are essential to maintain operational integrity.

To enhance security posture, organizations can implement strategies outlined in our comprehensive vulnerability management program design.

Furthermore, organizations should stay informed about emerging threats by following our insights on penetration testing methodology to proactively address vulnerabilities.