CVE-2026-82744 - Ash.Reactor change step fails open, skipping a change when its where guard raises

CVE-2026-82744 - Ash.Reactor change step fails open, skipping a change when its where guard raises

https://cvefeed.io/rssfeed/latest.atom / Tue, 09/01/2026 - 07:29
CVE ID :CVE-2026-82744
Published : Sept. 1, 2026, 4:18 a.m. | 13 minutes ago
Description :Not Failing Securely (Failing Open) vulnerability in ash-project ash skips an Ash.Reactor change when the guard controlling it raises, so a change meant to run does not. An Ash.Reactor change step can be gated by where validations that decide whether the change runs. Ash.Reactor.ChangeStep (lib/ash/reactor/steps/change_step.ex) evaluated those guards in apply_where_clauses/3, and apply_validation rescued any exception into {:error, error}. The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now {:raised, error}) and halts the step with an error, failing closed. This issue affects ash: from 3.0.0-rc.17 before 3.32.2.
Severity: 2.1 | LOW
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