Guardrails AI contains a code injection vulnerability in its Hub package installation mechanism

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2026-31233: 0.64% estimated exploitation activity in the next 30 days; percentile 50.47 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Guardrails AI thru 0.6.7 contains a code injection vulnerability (CWE-94) in its Hub package installation mechanism. When installing validator packages via guardrails hub install, the system retrieves a manifest from the Guardrails Hub and dynamically executes a script specified in the post_install field. The script path is constructed from untrusted manifest data and executed without proper validation or sanitization, allowing remote code execution. An attacker who can publish malicious packages to the Hub can inject arbitrary code that will be executed on any system where a victim installs the malicious package.

Published by the source

12 May 2026, 18:30 UTC

Last modified by the source

27 Oct 2026, 17:00 UTC

Source last checked

28 Oct 2026, 06:05 UTC

1. Revision 5 · amended · 28 Oct 2026

   Amended from osv record GHSA-r6hf-g5x6-7pv9

2. Revision 4 · amended · 27 Oct 2026

   Amended from ghsa record GHSA-r6hf-g5x6-7pv9

3. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-r6hf-g5x6-7pv9

4. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-r6hf-g5x6-7pv9

5. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-r6hf-g5x6-7pv9

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# Patch Next advisory brief: CVE-2026-31233

Advisory: Guardrails AI contains a code injection vulnerability in its Hub package installation mechanism
IDs: CVE-2026-31233, GHSA-r6hf-g5x6-7pv9
Record: https://patchnext.com/advisories/cve-2026-31233 (revision 5, source checked 28 Oct 2026, 06:05 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI guardrails-ai: affected <= 0.6.7

## Suggested inspection (read-only)
- `python -m pip show guardrails-ai`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on guardrails-ai.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-r6hf-g5x6-7pv9 (GitHub-reviewed advisory GHSA-r6hf-g5x6-7pv9 lists affected ranges: PyPI guardrails-ai >=0 <=0.6.7)
- Verified: https://osv.dev/vulnerability/GHSA-r6hf-g5x6-7pv9 (OSV record GHSA-r6hf-g5x6-7pv9 lists affected ranges: PyPI guardrails-ai >=0 <=0.6.7)

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