CVE-2026-108755 in Hatchet
Summary
by MITRE • 10/11/2026
Hatchet through 0.110.5 contains an allocation of resources without limits vulnerability that allows unauthenticated attackers to exhaust memory via the SNS ingestion endpoint. Attackers can send arbitrarily large or concurrent request bodies to POST /api/v1/sns/{tenant}/{event} with any UUID, which the SnsUpdate handler buffers before signature verification, degrading availability.
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Analysis
by VulDB Data Team • 10/11/2026
The vulnerability identified in Hatchet versions through 0.110.5 represents a critical failure in resource management within the application's Simple Notification Service ingestion endpoint. This flaw is categorized under CWE-770: Allocation of Resources Without Limits or Throttling, which describes scenarios where an application fails to restrict the amount of system resources allocated for a specific operation. In this context, the vulnerability resides specifically in the POST /api/v1/sns/{tenant}/{event} endpoint, which serves as the entry point for receiving SNS notifications from external sources. The core technical issue stems from the architectural decision made by the SnsUpdate handler to buffer incoming request bodies prior to performing signature verification. This design choice creates a window of opportunity where unauthenticated attackers can exploit the lack of input size constraints and concurrency controls to consume excessive amounts of server memory.
From an operational perspective, this vulnerability allows for straightforward denial-of-service attacks against the Hatchet infrastructure. An attacker does not require valid credentials or authenticated sessions to initiate the attack. By sending arbitrarily large request bodies or a high volume of concurrent requests with any UUID value, the attacker forces the SnsUpdate handler to allocate significant memory buffers for each incoming payload. Since these buffers are allocated before the system can validate whether the request is legitimate via signature verification, malicious traffic consumes resources that should otherwise be reserved for valid operations. This leads to rapid memory exhaustion on the affected servers, resulting in degraded availability and potentially causing a complete service outage as the application becomes unable to process new requests or manage existing connections effectively.
The exploitation of this vulnerability aligns with ATT&CK technique T1498: Network Denial of Service, specifically within the context of resource exhaustion attacks that target server-side resources rather than network bandwidth. The attacker leverages the asymmetry between the small amount of effort required to send a request and the large amount of system memory consumed by processing it. This is particularly dangerous in cloud-native or containerized environments where resource limits are often shared across multiple services, meaning an attack on one component can impact the stability of the entire platform. The ability to use any UUID further simplifies the attack vector, as there is no need for reconnaissance to find valid identifiers before launching the denial-of-service campaign.
To mitigate this vulnerability, immediate action should be taken by upgrading Hatchet to version 0.110.6 or later, where these resource allocation limits have been addressed. In environments where an upgrade cannot be performed immediately, defensive measures must be implemented at the network perimeter level. Web Application Firewalls and reverse proxies such as Nginx or Apache can be configured to enforce strict request body size limits on the /api/v1/sns/ endpoint path. Additionally, implementing rate limiting based on source IP address can help mitigate the impact of concurrent requests from a single attacker. It is also recommended to review application architecture to ensure that signature verification and other authentication checks are performed before allocating substantial memory buffers for input data processing, thereby preventing unauthenticated traffic from consuming critical system resources.