CVE-2026-82734: Non-finite Infinity/NaN decimal values bypass bounds constraints in Ash.Type.Decimal
Improper Validation of Specified Quantity in Input vulnerability in ash-project ash allows an attacker to submit a non-finite decimal value that bypasses numeric bounds constraints or fails later operations on the value.
Ash.Type.Decimal cast input through Ecto's decimal cast in castinput/2 and caststored/2 (lib/ash/type/decimal.ex) without checking that the resulting value is finite. Elixir's Decimal represents Infinity and NaN as valid structs, so a value such as "Infinity" or "NaN" passed casting and was persisted. Because NaN compares as false against every bound, min and max constraints do not reject it, and the stored special value later raises when used in Decimal arithmetic or is refused by the data layer, failing subsequent requests. The fix rejects any non-finite Decimal during casting.
This issue affects ash: from 1.28.0 before 3.32.2.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
ash-project ashto a version that resolves this vulnerability.Fixed in 3.32.2 - Compensating control
If you cannot upgrade yet, block or reject non-finite decimal inputs such as "Infinity" and "NaN" at the application/API boundary before they reach Ash casting (since they bypass bounds checks and later fail in Decimal arithmetic/data layer).