How severe is CVE-2026-4963?

CVE-2026-4963 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-4963 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4963?

CVE-2026-4963 affects Huggingface Smolagents. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4963?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4963 have an EU (EUVD) identifier?

Yes. CVE-2026-4963 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16726.

When was CVE-2026-4963 published?

CVE-2026-4963 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-4963

CVE-2026-4963 is a medium-severity vulnerability in Huggingface Smolagents with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 7.5
CVSS v4: 2.1
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16726
Weakness: CWE-74
Affected product: Huggingface Smolagents
Published: 2026-03-27
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-4963?: 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.
How severe is CVE-2026-4963?: CVE-2026-4963 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-4963 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4963?: CVE-2026-4963 affects Huggingface Smolagents. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4963?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4963 have an EU (EUVD) identifier?: Yes. CVE-2026-4963 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16726.
When was CVE-2026-4963 published?: CVE-2026-4963 was published on 2026-03-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:huggingface:smolagents:1.25.0:dev0:*:*:*:*:*:*

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