AIKIDO-2026-604587
ash_authentication is vulnerable to Denial of Service (DoS)
82
High Risk
This Affects:
ash_authenticationTL;DR
In ash_authentication, superlinear base62 decoding exhausts CPU and memory in AshAuthentication API key sign-in. bindecode62/1 in the same module is quadratic through Integer.undigits/2 and Integer.digits/2. Neither function caps byte_size/1, and AshAuthentication.Strategy.ApiKey.SignInPreparation passes the underscore-separated segments of the submitted key straight into both, before any key lookup and without prior authentication.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
ash_authentication is vulnerable to Denial of Service (DoS) in versions 4.8.0 - 4.14.2.
How to fix this
Upgrade the ash_authentication library to the patch version.
Links
Fix Commits
github.com/team-alembic/ash_authentication/commit/d5a5d4cb5cc17fbd6e2a120a6111b47accad4b8egithub.com/team-alembic/ash_authentication/commit/dfb19c897853686ab481c5e773f7a1a0c74dea04github.com/team-alembic/ash_authentication/commit/f3a53f480088419788d5c3934af3131fa9066773
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