CVE-2025-6921

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{"affected": [{"affectedData": [{"product": "huggingface/transformers", "vendor": "huggingface", "versions": [{"lessThan": "4.53.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@huntr.dev"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:huggingface:transformers:*:*:*:*:*:*:*:*", "matchCriteriaId": "028A5B9B-4F6A-41A1-8A94-8F904334B237", "versionEndExcluding": "4.53.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The huggingface/transformers library, versions prior to 4.53.0, is vulnerable to Regular Expression Denial of Service (ReDoS) in the AdamWeightDecay optimizer. The vulnerability arises from the _do_use_weight_decay method, which processes user-controlled regular expressions in the include_in_weight_decay and exclude_from_weight_decay lists. Malicious regular expressions can cause catastrophic backtracking during the re.search call, leading to 100% CPU utilization and a denial of service. This issue can be exploited by attackers who can control the patterns in these lists, potentially causing the machine learning task to hang and rendering services unresponsive."}, {"lang": "es", "value": "La biblioteca huggingface/transformers, versiones anteriores a la 4.53.0, es vulnerable a la Denegaci\u00f3n de Servicio por Expresiones Regulares (ReDoS) en el optimizador AdamWeightDecay. La vulnerabilidad surge del m\u00e9todo _do_use_weight_decay, que procesa expresiones regulares controladas por el usuario en las listas include_in_weight_decay y exclude_from_weight_decay. Expresiones regulares maliciosas pueden causar un retroceso catastr\u00f3fico durante la llamada a re.search, lo que lleva a una utilizaci\u00f3n del 100% de la CPU y una denegaci\u00f3n de servicio. Este problema puede ser explotado por atacantes que pueden controlar los patrones en estas listas, lo que podr\u00eda causar que la tarea de aprendizaje autom\u00e1tico se cuelgue y dejar los servicios sin respuesta."}], "id": "CVE-2025-6921", "lastModified": "2026-10-11T20:10:00.200", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security@huntr.dev", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-6921", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-09-23T14:56:14.042617Z", "version": "2.0.3"}}]}, "published": "2025-09-23T14:15:41.387", "references": [{"source": "security@huntr.dev", "tags": ["Patch"], "url": "https://github.com/huggingface/transformers/commit/47c34fba5c303576560cb29767efb452ff12b8be"}, {"source": "security@huntr.dev", "tags": ["Exploit", "Third Party Advisory"], "url": "https://huntr.com/bounties/287d15a7-6e7c-45d2-8c05-11e305776f1f"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security@huntr.dev", "type": "Secondary"}]}

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{"created": "2025-09-25T08:22:22.403674+00:00", "updated": "2025-09-25T08:22:22.403740+00:00", "vendors": ["huggingface", "huggingface$PRODUCT$transformers"]}