CVE-2026-77831: Elixir Inefficient List Append In Reduce
Appending to a list accumulator using `++` inside `Enum.reduce` causes quadratic copying (O(N^2)), which can lead to denial of service via high CPU and memory usage on large inputs. Prepend elements using `[elem | acc]` and reverse the list afterwards with `Enum.reverse/1`.
Elixirgreprules fetch cve-2026-77831-elixir-inefficient-list-append-in-reduce --engine opengrepDescription
Appending to a list accumulator using `++` inside `Enum.reduce` causes quadratic copying (O(N^2)), which can lead to denial of service via high CPU and memory usage on large inputs. Prepend elements using `[elem | acc]` and reverse the list afterwards with `Enum.reverse/1`.
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