CVE-2026-5241: A vulnerability in the LightGlue model loading path of huggingface/transformers version 5.2.0 allows an attack

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CRITICAL 9.6DOWNGRADE

CVE-2026-5241 is a critical-severity flaw (CVSS 9.6) affecting transformers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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_pret

Why this priority

Critical severity
Public exploit reference

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

Risk facts

CVSS score	9.6 (Critical)
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-829
Published	2026-06-03
Last modified	2026-08-28

Publisher (CNA): huntr.dev · Vendor: huggingface

Last updated 2026-08-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-03 14:16 UTCPublished CVE record published
2026-08-28 16:18 UTCUpdated Record last modified

huggingface transformers DOWNGRADE

Affected: 5.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.2.0 (Debian / Ubuntu)

apt-cache madison transformers sudo apt install transformers=<VERSION_BEFORE_5.2.0> sudo apt-mark hold transformers

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

dnf --showduplicates list transformers sudo dnf downgrade transformers-<VERSION_BEFORE_5.2.0> sudo dnf versionlock add transformers

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-2026-5241?

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

Is CVE-2026-5241 being exploited?

CVE-2026-5241 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-2026-5241 affect?

CVE-2026-5241 affects transformers. Severity is critical (CVSS 9.6). 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_c

How urgent is CVE-2026-5241?

Priority 51/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-1839 HIGH 7.8 UPGRADE A vulnerability in the HuggingFace Transformers library, specifically in the `Trainer` class, allows for arbit

References

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