{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-9856", "assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "state": "PUBLISHED", "assignerShortName": "@huntr_ai", "dateReserved": "2026-05-28T15:41:24.076Z", "datePublished": "2026-08-02T15:10:53.809Z", "dateUpdated": "2026-08-02T15:10:53.809Z"}, "containers": {"cna": {"title": "Path Traversal in huggingface/transformers", "providerMetadata": {"orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntr_ai", "dateUpdated": "2026-08-02T15:10:53.809Z"}, "descriptions": [{"lang": "en", "value": "A vulnerability in huggingface/transformers versions <=5.8.0.dev0 allows an attacker to perform arbitrary file writes via path traversal. The issue resides in the `save_pretrained()` methods of `PreTrainedTokenizerBase` and `ProcessorMixin`, where keys from the `chat_template` dictionary are used directly as filenames without proper validation. An attacker can exploit this by publishing a malicious Hugging Face Hub repository with a crafted `tokenizer_config.json` file. When a victim downloads and saves the tokenizer or processor, the attacker-controlled keys can escape the intended save directory, enabling arbitrary file writes with attacker-controlled content. This vulnerability affects multiple processors inheriting from `ProcessorMixin`, including Idefics, Florence, Gemma, Phi, and Qwen-VL."}], "affected": [{"vendor": "huggingface", "product": "huggingface/transformers", "versions": [{"version": "unspecified", "lessThan": "5.10.0", "status": "affected", "versionType": "custom"}]}], "references": [{"url": "https://huntr.com/bounties/362824d5-fe18-40e8-a6cf-62277f97a170"}, {"url": "https://github.com/huggingface/transformers/commit/eaaaf8494dd5386634ae37d1d122212fdc315be5"}], "metrics": [{"cvssV3_0": {"version": "3.0", "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L", "baseScore": 7.1, "baseSeverity": "HIGH"}}], "problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "cweId": "CWE-22"}]}], "source": {"advisory": "362824d5-fe18-40e8-a6cf-62277f97a170", "discovery": "EXTERNAL"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.10.0)"}}], "enrichment": {"confidence": 80.0, "confidence_source": "matching", "scores": [{"score": 80.0, "source": "matching"}]}, "original": {"product": "huggingface/transformers", "source": "cna", "vendor": "huggingface"}, "product": "transformers", "vendor": "huggingface"}], "created": "2026-08-02T19:00:04.298169+00:00", "updated": "2026-08-02T19:00:04.298211+00:00", "vendors": ["huggingface", "huggingface$PRODUCT$transformers"]}