Arbitrary Code Execution via Unsafe torch.load() in Trainer Checkpoint Loading in huggingface/transformers

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Summary

CVECVE-2026-1839
StatePUBLISHED
Assigner@huntr_ai
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-07 06:16:41 UTC
Updated2026-04-07 14:16:18 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.0 6.5 MEDIUM from [email protected]

CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:H

EPSS: 0.000200000 probability, percentile 0.052420000 (date 2026-04-07)

Problem Types: CWE-502 | CWE-502 CWE-502 Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary6.5MEDIUMCVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:H
3.0CNADECLARED6.5MEDIUMCVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:H

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
High

CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Huggingface Huggingface/transformers affected unspecified v5.0.0rc3 custom Not specified

References

ReferenceSourceLinkTags
github.com/huggingface/transformers/commit/03c8082ba4594c9b8d6fe190ca9be... [email protected] github.com
huntr.com/bounties/3c77bb97-e493-493d-9a88-c57f5c536485 134c704f-9b21-4f2e-91b3-4a467353bcc0 huntr.com
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