Hugging Face smolagents: Unsafe deserialization in Remote Python Executor leads to RCE

Exploitation

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

CVSS

10.0 · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

• CVE-2025-14931: 1.24% estimated exploitation activity in the next 30 days; percentile 69.28 (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.

Hugging Face smolagents Remote Python Executor Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Hugging Face smolagents. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of pickle data. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-28312.

Published by the source

23 Dec 2025, 21:30 UTC

Last modified by the source

29 Jun 2026, 12:26 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-q9r5-6hrr-9ph7

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-q9r5-6hrr-9ph7

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-q9r5-6hrr-9ph7

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# Patch Next advisory brief: CVE-2025-14931

Advisory: Hugging Face smolagents: Unsafe deserialization in Remote Python Executor leads to RCE
IDs: CVE-2025-14931, GHSA-q9r5-6hrr-9ph7
Record: https://patchnext.com/advisories/cve-2025-14931 (revision 3, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 10.0)
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 smolagents: affected <= 1.23.0

## Suggested inspection (read-only)
- `python -m pip show smolagents`: 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 smolagents.
- 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-q9r5-6hrr-9ph7 (GitHub-reviewed advisory GHSA-q9r5-6hrr-9ph7 lists affected ranges: PyPI smolagents >=0 <=1.23.0)
- Verified: https://osv.dev/vulnerability/GHSA-q9r5-6hrr-9ph7 (OSV record GHSA-q9r5-6hrr-9ph7 lists affected ranges: PyPI smolagents >=0 <=1.23.0)

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