CVE-2026-54457 TensorZero: Arbitrary file read and SSRF in TensorZero Gateway's internal object storage endpoint
Attackers can read arbitrary files or trigger SSRF via the internal object storage endpoint in TensorZero Gateway, potentially exposing credentials or internal services.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54457?
CVE-2026-54457 is a high-severity server-side request forgery vulnerability in tensorzero, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-54457?
3 open source packages ship an affected version, including tensorzero.
| Package | Affected | Fixed in |
|---|---|---|
tensorzero PyPI | All versions | 2026.6.0 |
tensorzero PyPI | All versions | 2026.6.0 |
tensorzero PyPI | All versions | 2026.6.0 |
How do I fix CVE-2026-54457?
Upgrade tensorzero to 2026.6.0 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-54457 being exploited?
There is no known exploitation of CVE-2026-54457 in the wild and no public exploit code.
Sources
Also known as GHSA-824w-x939-6cmc, PYSEC-2026-3541.