CVE-2026-4963: A weakness has been identified in huggingface smolagents 1.25.0.dev0

Routine

MEDIUM 6.3DOWNGRADE

CVE-2026-4963 is a medium-severity flaw (CVSS 6.3) affecting smolagents. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 t

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-74, CWE-94
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): VulDB · Vendor: huggingface

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 17:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

huggingface smolagents DOWNGRADE

Affected: 1.25.0 dev0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.25.0

1. Check installed version

apt-cache policy smolagents || rpm -q smolagents || smolagents --version

2. No fixed release: DOWNGRADE to a release before 1.25.0 (Debian / Ubuntu)

apt-cache madison smolagents sudo apt install smolagents=<VERSION_BEFORE_1.25.0> sudo apt-mark hold smolagents

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list smolagents sudo dnf downgrade smolagents-<VERSION_BEFORE_1.25.0> sudo dnf versionlock add smolagents

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4963?

smolagents: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4963 being exploited?

CVE-2026-4963 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4963 affect?

CVE-2026-4963 affects smolagents. Severity is medium (CVSS 6.3). 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

How urgent is CVE-2026-4963?

Priority 39/100. Public exploit reference

Software pages

Python vulnerabilities

References

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