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

Q: How do I fix CVE-2026-1839?

transformers: upgrade to 5.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-1839 being exploited?

CVE-2026-1839 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-2026-1839 affect?

CVE-2026-1839 affects transformers. Severity is high (CVSS 7.8). A vulnerability in the HuggingFace Transformers library, specifically in the `Trainer` class, allows for arbitrary code execution. The `_load_rng_state()` method in `src/transformers/trainer.py` at line 3059 calls `torch.load()` without the

Q: How urgent is CVE-2026-1839?

Priority 40/100. High severity; Public exploit reference

This month

HIGH 7.8UPGRADE

CVE-2026-1839 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 vulnerability in the HuggingFace Transformers library, specifically in the `Trainer` class, allows for arbitrary code execution. The `_load_rng_state()` method in `src/transformers/trainer.py` at line 3059 calls `torch.load()` without the `weights_only=True` parameter. This issue affects all versions of the library supporting `torch>=2.2` when used with PyTorch versions below 2.6, as the `safe_globals()` context manager provides no protection i

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	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-04-07
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-04-07 06:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

huggingface transformers UPGRADE

Affected: < 5.0.0 · 5.0.0 rc0 · 5.0.0 rc1 · 5.0.0 rc2

Fixed in: 5.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 5.0.0 (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-2026-1839?

transformers: upgrade to 5.0.0. Exact commands for each OS are on this page.

Is CVE-2026-1839 being exploited?

CVE-2026-1839 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-2026-1839 affect?

CVE-2026-1839 affects transformers. Severity is high (CVSS 7.8). A vulnerability in the HuggingFace Transformers library, specifically in the `Trainer` class, allows for arbitrary code execution. The `_load_rng_state()` method in `src/transformers/trainer.py` at line 3059 calls `torch.load()` without the

How urgent is CVE-2026-1839?

Priority 40/100. High severity; Public exploit reference

Software pages

PyTorch vulnerabilities

References

← Back to latest CVEs