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PYSEC-2026-3541

HighCVSS 7.7 / 10
Published Jul 23, 2026·Last modified Jul 23, 2026
Affected Components(0)

No affected components available

Description

Impact

The /internal/object_storage endpoint accepts a caller-supplied JSON storage_path parameter that dynamically overrides the TensorZero [object_storage] configuration.

By abusing the filesystem storage type, a caller can read arbitrary files from the gateway filesystem, including files that may contain sensitive credentials. Similarly, by abusing the s3_compatible storage type, the caller can coerce the gateway into making outbound object storage requests to attacker-chosen internal/cloud-metadata endpoints.

This vulnerability only applies when the gateway can be accessed by untrusted callers. If a developer's TensorZero deployment has authentication enabled, only authenticated callers can exploit this vulnerability. If a developer's deployment has authentication disabled, any caller can exploit this vulnerability.

Remediation

The vulnerability has been patched in version 2026.6.0. See PR #7527.

Workarounds

If developers are unable to upgrade a gateway that is exposed to untrusted callers, please block external access to the /internal/object_storage endpoint.

Risk Scores
Base Score
7.7

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information.

Threat Intelligence
7.1

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-54457
    Alias

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