{
    "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": "2026-08-03T14:57:43.370Z"
    },
    "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"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-03T14:57:31.978427Z",
                                "id": "CVE-2026-9856",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-03T14:57:43.370Z"
                }
            }
        ]
    }
}