CVE-2024-52003 in Traefik
Summary
by MITRE • 11/29/2024
Traefik (pronounced traffic) is an HTTP reverse proxy and load balancer. There is a vulnerability in Traefik that allows the client to provide the X-Forwarded-Prefix header from an untrusted source. This issue has been addressed in versions 2.11.14 and 3.2.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.
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Analysis
by VulDB Data Team • 11/27/2025
The vulnerability identified as CVE-2024-52003 affects Traefik, a widely deployed HTTP reverse proxy and load balancer that serves as a critical component in modern microservices architectures and cloud-native environments. This security flaw resides in Traefik's handling of the X-Forwarded-Prefix header, which is commonly used to communicate the original URL path when requests pass through multiple proxies or load balancers. The vulnerability stems from insufficient validation of the X-Forwarded-Prefix header when it originates from untrusted client sources, creating a potential attack vector that could be exploited to manipulate application behavior and potentially bypass security controls. The issue represents a significant concern for organizations relying on Traefik for their API gateway and ingress controller functionality, particularly in environments where multiple tiers of proxies are employed.
The technical flaw manifests when Traefik processes the X-Forwarded-Prefix header without proper sanitization or validation of its contents, allowing malicious clients to inject arbitrary prefix values that can alter how the proxy routes requests or modifies URL paths. This behavior directly relates to CWE-20, which describes improper input validation, and can enable various attack patterns including path traversal, URL manipulation, and potentially authorization bypass scenarios. The vulnerability is particularly dangerous in environments where Traefik serves as an ingress controller for Kubernetes clusters, as it could allow attackers to manipulate request routing and potentially access resources they should not have access to. Attackers could leverage this weakness to craft requests that appear to originate from trusted sources while actually containing malicious prefix values that alter the intended application behavior.
The operational impact of this vulnerability extends beyond simple request manipulation, as it can potentially enable more sophisticated attacks that exploit the trust relationships within proxy chains. When Traefik processes unvalidated X-Forwarded-Prefix headers, it may inadvertently modify application logic paths, alter authentication flows, or bypass security mechanisms that depend on proper URL path handling. This vulnerability aligns with ATT&CK technique T1071.004 for application layer protocol manipulation and could be leveraged as part of broader attack chains targeting API gateways and ingress controllers. Organizations using Traefik in production environments face the risk of unauthorized access to backend services, data leakage, or manipulation of application behavior through crafted requests that exploit this header processing weakness. The vulnerability particularly affects deployments where Traefik serves as a critical ingress point for multiple applications or services, as the impact scales with the number of services relying on proper request routing and path handling.
The recommended mitigation for CVE-2024-52003 involves immediate upgrade to Traefik versions 2.11.14 or 3.2.1, which contain the necessary patches to address the improper handling of the X-Forwarded-Prefix header. Organizations should prioritize this upgrade across all environments where Traefik is deployed as an ingress controller or reverse proxy, particularly in Kubernetes clusters and microservices architectures. Given that no workarounds exist for this vulnerability, administrators must ensure that all Traefik instances are updated as soon as possible to prevent potential exploitation. Security teams should also conduct comprehensive audits of their Traefik configurations to identify any instances where the X-Forwarded-Prefix header might be processed from untrusted sources, and implement proper header validation policies. The vulnerability underscores the importance of maintaining up-to-date proxy configurations and the necessity of validating all incoming headers, especially those used for routing and path manipulation in multi-tiered network architectures. Organizations should also consider implementing additional monitoring and logging around Traefik header processing to detect potential exploitation attempts and ensure rapid incident response capabilities.