AIKIDO-2026-553821
ash is vulnerable to Incorrect Behavior Order: Validate Before Canonicalize
21
Low Risk
This Affects:
ashTL;DR
The Ash.Type.CiString type checks max_length and match constraints against the raw input before case folding. Unicode case mapping is not length preserving, so a string that passes validation can grow during folding and exceed those constraints. This can overflow downstream columns or break invariants that rely on the constraint. The fix case-folds the value before checking the length and match constraints.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use Ash.Type.CiString with length or match constraints together with case folding.
Background info
ash is vulnerable to Incorrect Behavior Order: Validate Before Canonicalize in versions 1.30.0 - 3.32.1.
How to fix this
Upgrade the ash library to the patch version.
Links
GitHub Release
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