Which versions of Smolagents are affected by CVE-2026-4963?

Organizations using A weakness should be aware of moderate risk from CVE-2026-4963, a code injection vulnerability rated CVSS 5.3.

Is there a public PoC exploit available for CVE-2026-4963?

Yes, a public proof-of-concept exploit is available for CVE-2026-4963. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-4963?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Validate input sanitization for user-controlled parameters.

Smolagents CVE-2026-4963

Q: What is the CVSS score of CVE-2026-4963?

CVE-2026-4963 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-16726 LOW

Code Injection (CWE-94)

2026-03-27 VulDB

GHSA-54fq-v6x8-244g

RCE Code Injection Smolagents

2.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.1 LOW

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

5.3 (MEDIUM) 2.1 (LOW)

PoC Detected

Mar 30, 2026 - 13:26 vuln.today

Public exploit code

EUVD ID Assigned

Mar 27, 2026 - 17:15 euvd

EUVD-2026-16726

Analysis Generated

Mar 27, 2026 - 17:15 vuln.today

CVE Published

Mar 27, 2026 - 17:05 nvd

MEDIUM 5.3

DescriptionCVE.org

A weakness has been identified in huggingface smolagents 1.25.0.dev0. This 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. This manipulation causes code injection. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way. If you want to get best quality of vulnerability data, you may have to visit VulDB.

AnalysisAI

Code injection in HuggingFace smolagents 1.25.0.dev0 allows remote attackers without authentication to execute arbitrary code through incomplete remediation of CVE-2025-9959 in the local Python executor component. The vulnerability affects the evaluate_augassign, evaluate_call, and evaluate_with functions in src/smolagents/local_python_executor.py, with publicly available exploit code and active public disclosure despite lack of vendor response.

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.3 (Medium) with network-accessible attack vector (AV:N), low attack complexity (AC:L), and no privileges required (PR:N) indicates a straightforward remote exploitation path. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker without authentication submits a specially crafted input to a web application using smolagents that triggers the evaluate_call or evaluate_augassign function. The malicious input bypasses insufficient sanitization checks (the incomplete fix for CVE-2025-9959) and causes arbitrary Python code execution within the application's runtime context. …
Remediation	No vendor-released patch has been confirmed at time of analysis, as HuggingFace did not respond to early disclosure. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-4963 vulnerability details – vuln.today

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