TensorZero is an open-source LLMOps platform that unifies an LLM gateway, observability, evaluation, optimization, and experimentation. Prior to 2026.6.0, the TensorZero Gateway /internal/object_storage endpoint accepts a caller-supplied JSON storage_path parameter that dynamically overrides the [object_storage] configuration. Selecting the filesystem storage type allows arbitrary files on the gateway filesystem to be read, including credential files. Selecting the s3_compatible storage type causes outbound object-storage requests to attacker-chosen internal or cloud-metadata endpoints. Exploitation requires access to the gateway, which can be authenticated or unauthenticated depending on deployment configuration. This issue is fixed in version 2026.6.0.

CVE-2026-54457 affects TensorZero, an open-source LLMOps platform, prior to version 2026.6.0. The vulnerability exists in the /internal/object_storage endpoint, which accepts a caller-supplied JSON storage_path parameter that can override the object storage configuration. Attackers can exploit the filesystem storage type to read arbitrary files from the gateway filesystem, including sensitive credential files. The s3_compatible storage type can be abused to trigger server-side request forgery (SSRF) against internal or cloud metadata endpoints such as AWS IMDS. Exploitation depends on whether the gateway is deployed with or without authentication, making the attack surface variable. The vulnerability combines arbitrary file read and SSRF primitives, posing significant risk in cloud-hosted deployments. A fix was released in version 2026.6.0. Patches and advisories are available via the official GitHub repository.