CVE-2026-14534— Trail of Bits Fickling 输入验证错误漏洞

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 UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist, fickling's check_safety() function returns LIKELY_SAFE with zero findings for pickle payloads that invoke dangerous functions including _posixsubprocess.fork_exec (C-level process spawner capable of executing arbitrary binaries), site.execsitecustomize (executes arbitrary site customization code), and atexit._run_exitfuncs (triggers all registered exit handler callbacks). The fickling.load() API chains check_safety() into pickle.loads() as an explicit security gate; a LIKELY_SAFE verdict causes the payload to be deserialized and executed. This shares the same root cause as CVE-2026-22607 (cProfile), CVE-2025-67748 (pty), and CVE-2025-67747 (marshal/types). OvertlyBadEvals does not flag these modules because they are standard library imports. UnsafeImports does not flag them because they are not in the denylist. The UnusedVariables heuristic is defeated by the SETITEMS opcode pattern.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

不完整的黑名单

Trail of Bits Fickling 输入验证错误漏洞

Trail of Bits Fickling是美国Trail of Bits公司的一款针对Python序列化漏洞的黑客工具。 Trail of Bits Fickling 0.1.10及之前版本存在安全漏洞，该漏洞源于未在UNSAFE_IMPORTS黑名单中包含Python标准库模块_posixsubprocess、site和atexit，导致check_safety()函数对调用危险函数的pickle有效载荷返回LIKELY_SAFE，从而使有效载荷被反序列化并执行，可能导致任意代码执行。

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