Is CVE-2026-15143 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-15143?

CVE-2026-15143 has a CVSS v3 severity of CRITICAL (9.3).

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CVE-2026-15143

Description

A flaw was found in the file_type content detector of guardrails-detectors. This vulnerability allows a remote attacker to supply an arbitrary XML Schema Definition (XSD) string, which is processed without proper restrictions. This can lead to server-side requests to arbitrary URLs or local file reads, potentially resulting in sensitive information disclosure, such as cloud provider credentials or access to internal network services.