High severity · published Apr 7, 2026
CVE-2026-1839
Arbitrary Code Execution via Unsafe torch.load() in Trainer Checkpoint Loading in huggingface/transformers
7.8
CVSS
0.4%
EPSS
No
On KEV
Description
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 in these versions. An attacker can exploit this vulnerability by supplying a malicious checkpoint file, such as `rng_state.pth`, which can execute arbitrary code when loaded. The issue is resolved in version v5.0.0rc3.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HU
huggingface/transformers · huggingface
before v5.0.0rc3 · source: vendor
TR
Transformers · Huggingface
before 5.0.0; 5.0.0; 5.0.0; 5.0.0 · source: NVD
Affected product
HU
huggingface/transformers
huggingface
More from huggingface/transformers
9.6
CVE-2026-5241
Policy Bypass in LightGlue Nested Config Resolution in huggingface/transformers
7.8
CVE-2026-4372
Arbitrary Remote Code Execution via `_attn_implementation_internal` Config Injection in huggingface/transformers
7.1
CVE-2026-9856
Path Traversal in huggingface/transformers