huggingface/transformers: Arbitrary Code Execution During Model Initialization in the LightGlue Model Loading Path
A vulnerability in the LightGlue model loading path of huggingface/transformers version 5.2.0 allows an attacker-controlled model repository to execute arbitrary code during model initialization. The issue arises because the trust_remote_code parameter, intended to prevent remote code execution, is overridden by untrusted serialized configuration data in a nested code path. Specifically, when loading a LightGlue model using AutoModel.from_pretrained() with trust_remote_code=False, the LightGlueConfig reads the trust_remote_code value from the untrusted config.json file and propagates it into nested AutoConfig.from_pretrained() calls. This results in the execution of attacker-provided Python modules, even when the victim explicitly disables remote code execution. The vulnerability poses a high risk for environments such as API inference servers, research notebooks, CI/CD pipelines, and model evaluation workers, potentially leading to credential theft, lateral movement, or persistence/backdoor deployment.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | transformers | < 5.5.0 | 5.5.0 |
References
- https://access.redhat.com/security/cve/CVE-2026-5241
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5241.json
- https://access.redhat.com/errata/RHSA-2026:34456
- https://access.redhat.com/errata/RHSA-2026:37275
- https://bugzilla.redhat.com/show_bug.cgi?id=2484384
- https://github.com/huggingface/transformers/commit/676559d5022b74aaa0cee1cee0842b7f27c5320e
- https://huntr.com/bounties/ceb3ce1a-4c45-497a-b25e-cb9a7685e619
- https://github.com/advisories/GHSA-fgcw-684q-jj6r
- https://nvd.nist.gov/vuln/detail/CVE-2026-5241
- https://access.redhat.com/errata/RHSA-2026:42644
- https://github.com/huggingface/transformers
- https://github.com/pypa/advisory-database/tree/main/vulns/transformers/PYSEC-2026-2290.yaml
- CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N- Weakness (CWE)
CWE-829- Platform
- Python (PyPI)
- Package
transformers- Disclosed
- 03.06.2026
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2290 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-fgcw-684q-jj6r - CC BY 4.0
Vulnerability history: transformers
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 32
- First → latest
- 05.2023 09.2026
- Without a fix
- 9
- Exploited in attacks
- 0
Severity breakdown
- High 18
- Medium 12
- Low 2
Disclosures per year
- 2023: 3
- 2024: 4
- 2025: 20
- 2026: 5
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