Summaryinfo

A vulnerability was found in huggingface smolagents 1.25.0.dev0 and classified as critical. This vulnerability affects the function evaluate_augassign/evaluate_call/evaluate_with of the file src/smolagents/local_python_executor.py of the component Incomplete Fix CVE-2025-9959. Such manipulation leads to code injection. This vulnerability is referenced as CVE-2026-4963. It is possible to launch the attack remotely. Furthermore, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability was found in huggingface smolagents 1.25.0.dev0 and classified as critical. Affected by this issue is the function evaluate_augassign/evaluate_call/evaluate_with of the file src/smolagents/local_python_executor.py of the component Incomplete Fix CVE-2025-9959. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability.

The advisory is shared for download at gist.github.com. This vulnerability is handled as CVE-2026-4963. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1059.

The exploit is available at gist.github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• huggingface

Name

• smolagents

Version

• 1.25.0.dev0

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

Submitinfo

Accepted

• Submit #777623: HuggingFace smolagents 1.25.0.dev0 CWE-693 (by Eric-z)

Duplicate

• Submit #XXXXXX: Xxxxxxxxxxx Xxxxxxxxxx X.xx.x.xxxx Xxx-xxx (by Eric-z)
• Submit #XXXXXX: Xxxxxxxxxxx Xxxxxxxxxx X.xx.x.xxxx Xxx-xxx (by Eric-z)

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