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EUVD-2026-263792

2026-10-02T12:35:51.619961+00:00

EUVD-2026-263792

fkie_cve-2025-67747

2026-10-02T12:35:51.619995+00:00

Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 are missing `marshal` and `types` from the block list of unsafe module imports. Fickling started blocking both modules to address this issue. This allows an attacker to craft a malicious pickle file that can bypass fickling since it misses detections for `types.FunctionType` and `marshal.loads`. A user who deserializes such a file, believing it to be safe, would inadvertently execute arbitrary code on their system. This impacts any user or system that uses Fickling to vet pickle files for security issues. The issue was fixed in version 0.1.6.

GHSA-565g-hwwr-4pp3 — Fickling has missing detection for marshal.loads and types.FunctionType in unsafe modules list

2026-10-02T12:35:51.620028+00:00

Affected: PyPI: fickling

## Fickling Assessment

Based on the test case provided in the original report below, this bypass was caused by `marshal` and `types` missing from the block list of unsafe module imports, Fickling started blocking both modules to address this issue. This was fixed in https://github.com/trailofbits/fickling/pull/186. The crash is unrelated and has no security impact—it will be addressed separately.

## Original report

### Summary There's missing detection for the python modules, `marshal.loads` and `types.FunctionType` and Fickling throws unhandled ValueErrors when the stack is deliberately exhausted.

### Details Fickling simply doesn't have the aforementioned modules in its list of unsafe imports and therefore it fails to get detected.

### PoC The following is a disassembled view of a malicious pickle file that uses these modules: ``` 0: \x80 PROTO 4 2: \x95 FRAME 0 11: \x8c SHORT_BINUNICODE 'marshal' 20: \x8c SHORT_BINUNICODE 'loads' 27: \x93 STACK_GLOBAL 28: \x94 MEMOIZE (as 0) 29: h BINGET 0 31: C SHORT_BINBYTES b'\xe3\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\xf30\x00\x00\x00\x95\x00S\x00S\x01K\x00r\x00\\\x00R\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"\x00S\x025\x01\x00\x00\x00\x00\x00\x00 \x00g\x01)\x03\xe9\x00\x00\x00\x00N\xda\x02id)\x02\xda\x02os\xda\x06system\xa9\x00\xf3\x00\x00\x00\x00\xda\x08\xda\x08r\t\x00\x00\x00\x01\x00\x00\…

PYSEC-2026-1368 — Fickling has missing detection for marshal.loads and types.FunctionType in unsafe modules list

2026-10-02T12:35:51.620089+00:00

Affected: PyPI: fickling

## Fickling Assessment

## Original report

### Summary There's missing detection for the python modules, `marshal.loads` and `types.FunctionType` and Fickling throws unhandled ValueErrors when the stack is deliberately exhausted.

### Details Fickling simply doesn't have the aforementioned modules in its list of unsafe imports and therefore it fails to get detected.