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CVE-2026-57456 is an arbitrary code execution vulnerability in Vim affecting versions prior to 9.2.0699. The flaw is in Vim's Python omni-completion implementation in runtime/autoload/python3complete.vim and the legacy pythoncomplete.vim. To build completion data, the feature reconstructs Python function and class definitions from the current buffer and executes the reconstructed source with Python exec(). During reconstruction, each scope's docstring is embedded inside a triple-quoted Python string literal without proper escaping. Because the docstring content is taken from the buffer and inserted verbatim, a crafted Python buffer can include an embedded triple-quote sequence that breaks out of the generated string literal and injects attacker-controlled Python code into the reconstructed source. When omni-completion is invoked, the injected code is executed in the Vim process. The issue is a code-generation flaw caused by unsafe construction of executable Python source from untrusted buffer content.
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A specific vulnerability referenced in a Miracle Linux advisory affecting Vim-related packages; no further technical details are provided in the content.
An arbitrary code execution vulnerability in Vim via malicious docstrings in Python omni-completion.
An arbitrary code execution vulnerability in Vim's Python omni-completion feature caused by unsafe reconstruction and execution of buffer-derived Python code via exec(), allowing attacker-controlled Python execution through malicious docstrings.
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Cross-references every affected SKU, including bundled OEM variants.
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