{"id":"CVE-2026-1839","summary":"Arbitrary Code Execution via Unsafe torch.load() in Trainer Checkpoint Loading in huggingface/transformers","details":"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\u003e=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.","aliases":["GHSA-69w3-r845-3855","PYSEC-2026-2288"],"modified":"2026-07-15T01:49:09.277072785Z","published":"2026-04-07T05:22:00.959Z","related":["CGA-55qm-vfpv-pfvr"],"database_specific":{"cna_assigner":"@huntr_ai","cwe_ids":["CWE-502"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1839.json"},"references":[{"type":"WEB","url":"https://huntr.com/bounties/3c77bb97-e493-493d-9a88-c57f5c536485"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1839.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1839"},{"type":"FIX","url":"https://github.com/huggingface/transformers/commit/03c8082ba4594c9b8d6fe190ca9bed0e5f8ca396"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/huggingface/transformers","events":[{"introduced":"0"},{"fixed":"08810b1e278938278c50153ee1edfd7a20a759da"},{"introduced":"cbc6716945cff1d8e124d344ba0150e6e27f8b6e"},{"fixed":"03c8082ba4594c9b8d6fe190ca9bed0e5f8ca396"}],"database_specific":{"cpe":["cpe:2.3:a:huggingface:transformers:*:*:*:*:*:*:*:*","cpe:2.3:a:huggingface:transformers:5.0.0:rc0:*:*:*:*:*:*","cpe:2.3:a:huggingface:transformers:5.0.0:rc1:*:*:*:*:*:*","cpe:2.3:a:huggingface:transformers:5.0.0:rc2:*:*:*:*:*:*"],"extracted_events":[{"introduced":"0"},{"fixed":"5.0.0"},{"introduced":"5.0.0-rc0"},{"last_affected":"5.0.0-rc0"},{"introduced":"5.0.0-rc1"},{"last_affected":"5.0.0-rc1"},{"introduced":"5.0.0-rc2"},{"last_affected":"5.0.0-rc2"}],"source":["CPE_RANGE","CPE_STRING","REFERENCES"]}}],"versions":["5.0.0-rc0","5.0.0-rc1","5.0.0-rc2","v4.56.1-Vault-Gemma-preview","4.55.0-GLM-4.5V-preview-GLM-4.5V-preview","4.55.0-GLM-4.5V-preview","v4.53.2-Ernie-4.5-preview","v4.53.2-modernbert-decoder-preview","v4.52.4-Kyutai-STT-preview","v4.52.4-VJEPA-2-preview","v4.52.4-ColQwen2-preview","v4.51.3-CSM-preview","v4.51.3-GraniteMoeHybrid-preview","v4.51.3-LlamaGuard-preview","v4.51.3-D-FINE-preview","v4.51.3-SAM-HQ-preview","v4.51.3-BitNet-preview","v4.51.3-InternVL-preview","v4.51.3-Janus-preview","v4.51.3-TimesFM-preview","v4.51.3-MLCD-preview","v4.51.3-Qwen2.5-Omni-preview","v4.50.3-DeepSeek-3","v4.49.0-Mistral-3","v4.49.0-AyaVision","v4.49.0-SigLIP-2","v4.49.0-SmolVLM-2","v4.33.1","v4.16.0","v4.15.0","v4.14.0","v4.13.0","v4.12.0","v4.11.0","v4.10.0","v4.9.0","v4.8.0","v4.7.0","v4.6.0","v4.5.0","v4.4.0","v4.3.0.rc1","4.3.0.rc1","v4.2.0","v4.1.1","v4.1.0","v3.5.0","v3.4.0","v3.3.1","v3.3.0","v3.2.0","v3.1.0","v3.0.2","v3.0.1","3.0.1","v3.0.0","v2.11.0","v2.10.0","v2.9.1","v2.9.0","v2.8.0","v2.7.0","v2.6.0","v2.5.1","v2.5.0","v2.4.1","v2.4.0","v2.3.0","v2.2.2","v2.2.1","v2.2.0","v2.1.1","v2.1.0","v2.0.0","1.2.0","1.1.0","1.0","v0.6.2","v0.6.1","v0.6.0","v0.5.1","v0.5.0","0.5.0","v0.4.0","v0.3.0","v0.2.0","v0.1.2","0.1.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1839.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:H"}]}