What is CVE-2026-1839?

CVE-2026-1839 is a high-severity vulnerability in Huggingface Huggingface/transformers, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2026-04-07.

How severe is CVE-2026-1839?

High severity. CVSS v3 base score is 7.8 out of 10.

Deserialization in Huggingface Huggingface/transformers

CVE-2026-1839

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 th…

Vulnerability class: Insecure Deserialization

EPSS: 0.000 (6.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Huggingface Huggingface/transformers — versions unspecified
Huggingface Transformers — versions 5.0.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

security@huntr.dev (Exploit, Third Party Advisory)
security@huntr.dev (Patch)

Frequently asked questions

What is CVE-2026-1839?: CVE-2026-1839 is a high-severity vulnerability in Huggingface Huggingface/transformers, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2026-04-07.
How severe is CVE-2026-1839?: High severity. CVSS v3 base score is 7.8 out of 10.