CVE-2026-82734 Non-finite Infinity/NaN decimal values bypass bounds constraints in Ash.Type.Decimal
Attackers can inject non-finite decimal values to bypass bounds checks, causing application crashes or data persistence failures in the Ash framework.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-82734?
CVE-2026-82734 is a low-severity vulnerability in ash-project ash, published on 1 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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 cast_input/2 and cast_stored/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.
Weakness: CWE-1284
Which versions are affected by CVE-2026-82734?
1 open source package ship an affected version, including ash.
| Package | Affected | Fixed in |
|---|---|---|
ash Hex | From 1.28.0 | 3.32.2 |
How do I fix CVE-2026-82734?
Upgrade ash to 3.32.2 or later.
Is CVE-2026-82734 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82734 exists.
Sources
Also known as EEF-CVE-2026-82734, GHSA-mvvh-q33h-q62v.