What is CVE-2026-5241?
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.
The record classifies CVE-2026-5241 under weakness class CWE-829. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 152 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8 — HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N - EPSS (FIRST)
- 0.9% probability of exploitation in the next 30 days, higher than 59.6% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 6.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-06-03, last modified 2026-09-01
Is CVE-2026-5241 being exploited?
It currently carries a trending score of 20 in the Threadlinqs vulnerability feed.
Affected products and versions
- huggingface: huggingface/transformers
Affected software packages:
pip:transformers— patched in 5.5.0
How to fix CVE-2026-5241
Fixed versions are recorded for 1 package: pip:transformers 5.5.0. No vendor patch reference has been recorded for CVE-2026-5241 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-5241
1 tracked threat in the Threadlinqs corpus references CVE-2026-5241, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on .