Don't allow update_into to mutate immutable objects #8230
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reaperhulk
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* Don't allow update_into to mutate immutable objects (#8230) * add changelog for 39.0.1 * oops * bump versions * remove circle --------- Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>
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Does this involve interface changes? |
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It behaves exactly the same unless you were passing an immutable type (e.g. a byte string). So the interface has technically changed but in practice it has only changed for the vulnerable path. |
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In this case, change the buf class type from it can't use the def update_into(self, data: bytes, buf: bytes) -> int: |
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I'm not sure what the effect of this vulnerability is. |
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Unfortunately the Python type hint system doesn’t have a way to represent “all objects that implement the buffer protocol but only the mutable types”, so |
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What is the impact of this cve? I don't seem to feel the threat of this vulnerability. |
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