MEDIUM5.9

PYSEC-2026-1431

Guardrails AI vulnerable to Improper Restriction of XML External Entity Reference

Quick fix

PYSEC-2026-1431 — guardrails-ai: upgrade to the fixed version with the command below.

pip install --upgrade 'guardrails-ai>=0.5.0'

Details

RAIL documents are an XML-based format invented by Guardrails AI to enforce formatting checks on LLM outputs. Guardrails users that consume RAIL documents from external sources are vulnerable to XXE, which may cause leakage of internal file data via the SYSTEM entity.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/guardrails-ai

Introduced in: 0Fixed in: 0.5.0

Fixpip install --upgrade 'guardrails-ai>=0.5.0'

References

https://nvd.nist.gov/vuln/detail/CVE-2024-6961[ADVISORY]
https://github.com/guardrails-ai/guardrails/pull/922[WEB]
https://github.com/guardrails-ai/guardrails/commit/f3d806afee31e2e3f97af682d16c3c1bc0d3c380[WEB]
https://github.com/guardrails-ai/guardrails[PACKAGE]
https://research.jfrog.com/vulnerabilities/guardrails-rail-xxe-jfsa-2024-001035519[WEB]
https://pypi.org/project/guardrails-ai[PACKAGE]
https://github.com/advisories/GHSA-f8hx-f4xw-c646[ADVISORY]