Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M
CVE-2026-54457TensorZero: Arbitrary file read and SSRF in TensorZero Gateway's internal object storage endpoint
High 7.7
In plain English
A high-severity server-side request forgery in tensorzero from tensorzero. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | tensorzero | 2026.6.0 | GHSA-824w-x939-6cmc |
| PyPI | tensorzero | 2026.6.0 | PYSEC-2026-3541 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tensorzero | tensorzero | < 2026.6.0 |
Weakness: CWE-552, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N