Incomplete List of Disallowed Inputs

Overview fickling is an A static analyzer and interpreter for Python pickle data Affected versions of this package are vulnerable to Incomplete List of Disallowed Inputs via the checksafety function. An attacker can execute arbitrary code by crafting pickle payloads that import unlisted standard...

CVE-2026-14534 Fickling check_safety() bypass via unlisted standard library modules (_posixsubprocess, site, atexit)

Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules posixsubprocess, site, and atexit in the UNSAFEIMPORTS denylist fickle.py. Because these modules are absent from the denylist, fickling's checksafety function returns LIKELYSAFE with zero...

fickling's `platform` module subprocess invocation evades `check_safety()` with `LIKELY_SAFE`

Our assessment We added platform to the blocklist of unsafe modules https://github.com/trailofbits/fickling/commit/351ed4d4242b447c0ffd550bb66b40695f3f9975. It was not possible to inject extra arguments to file without first monkey-patching platform.followsymlinks with the pickle, as it always...