Code Injection Vulnerability in Hugging Face Smolagents Affects Local Python Executor
CVE-2026-4963

5.3MEDIUM

Key Information:

Vendor

Huggingface

Status
Smolagents
Vendor
CVE Published:
27 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4963?

A code injection vulnerability has been discovered in Hugging Face's smolagents version 1.25.0.dev0, specifically within the local Python executor. This issue arises from inadequate fixes related to a previous vulnerability, enabling potential remote code execution through manipulated function calls. The exploit has been publicly disclosed, raising concerns for users regarding the integrity and security of their systems, as it could be leveraged for various attack vectors. Despite early notification to the vendor, no response has been received.

Affected Version(s)

smolagents 1.25.0.dev0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4963 - Proof of Concept

References

https://vuldb.com/?id.353840
vdb-entrytechnical-description
https://vuldb.com/?ctiid.353840
signaturepermissions-required
https://vuldb.com/?submit.777623
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eric-z (VulDB User)
VulDB
.