CVE-2026-4372: A critical remote code execution vulnerability exists in all versions of the HuggingFace transformers library

Q: How do I fix CVE-2026-4372?

transformers: upgrade to 5.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-4372 being exploited?

CVE-2026-4372 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-4372 affect?

CVE-2026-4372 affects transformers. Severity is high (CVSS 7.8). A critical remote code execution vulnerability exists in all versions of the HuggingFace transformers library prior to version 5.3.0. The vulnerability allows an attacker to craft a malicious `config.json` file containing the `_attn_impleme

Q: How urgent is CVE-2026-4372?

Priority 46/100. High severity; Public exploit reference

This month

HIGH 7.8UPGRADE

CVE-2026-4372 is a high-severity flaw (CVSS 7.8) affecting transformers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A critical remote code execution vulnerability exists in all versions of the HuggingFace transformers library prior to version 5.3.0. The vulnerability allows an attacker to craft a malicious `config.json` file containing the `_attn_implementation_internal` field set to an attacker-controlled HuggingFace Hub repository ID. When a victim loads this model using the standard `AutoModelForCausalLM.from_pretrained()` API, the library downloads and exe

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-1066, CWE-502
Published	2026-05-24
Last modified	2026-07-23

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

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-24 14:16 UTCPublished CVE record published
2026-07-23 17:10 UTCUpdated Record last modified

huggingface transformers UPGRADE

Affected: < 5.3.0

Fixed in: 5.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 5.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade transformers

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade transformers

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-4372?

transformers: upgrade to 5.3.0. Exact commands for each OS are on this page.

Is CVE-2026-4372 being exploited?

CVE-2026-4372 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-2026-4372 affect?

CVE-2026-4372 affects transformers. Severity is high (CVSS 7.8). A critical remote code execution vulnerability exists in all versions of the HuggingFace transformers library prior to version 5.3.0. The vulnerability allows an attacker to craft a malicious `config.json` file containing the `_attn_impleme

How urgent is CVE-2026-4372?

Priority 46/100. High 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
CVE-2026-5241 CRITICAL 9.6 DOWNGRADE A vulnerability in the LightGlue model loading path of huggingface/transformers version 5.2.0 allows an attack

References

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