A critical denial of service vulnerability in the GoFiber v3 framework enables unauthenticated remote attackers to crash systems by triggering an unbounded memory allocation.

The vulnerability stems from improper handling of the fiber_flash cookie, which leads to an unbounded memory allocation via unvalidated msgpack deserialization. This flaw is reachable by unauthenticated attackers on every GoFiber v3 endpoint, regardless of application specific configuration.

The ability for an unauthenticated attacker to force an allocation of up to 85GB of memory renders the target service immediately unavailable. With a CVSS score of 7.5, this high severity vulnerability poses a significant risk to service continuity and operational stability, as it allows for trivial remote denial of service attacks against any infrastructure relying on the affected framework.

Immediate Action: Update the GoFiber dependency to version 3.1.0 or later to include the mandatory fix for the msgpack deserialization process.

Proactive Monitoring: Monitor server memory utilization metrics and application logs for abnormal spikes or sudden crashes that may indicate exploitation attempts.

Compensating Controls: Implement strict size limits on incoming cookie headers at the load balancer or web application firewall level to prevent excessively large payloads from reaching the application logic.

Public Exploit Available: Unknown

Given the ease of exploitation and the potential for total service disruption, organizations using GoFiber v3 must prioritize upgrading to version 3.1.0 immediately. Organizations unable to patch should deploy edge filtering to sanitize cookie headers until the update can be successfully integrated and tested in their production environments.