Vulnerability · Published Aug 9, 2026 · Assigned by EEF
CVE-2026-70395Predicate injection in manage_relationship belongs_to lookup discloses secret lookup keys in Ash
Low 2.1
In plain English
A low-severity security flaw in ash from ash-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Official description
Improper Neutralization of Special Elements in Data Query Logic vulnerability in ash-project ash allows an attacker to forge a relationship to a record they cannot name, and to recover the secret value used to look it up. When manage_relationship is used with on_lookup: :relate on a belongs_to relationship, the client-supplied lookup value is passed to Ash.Query.filter/2 without being cast to the attribute type. A nested map submitted where a scalar is expected is therefore interpreted as a filter predicate rather than a literal, so a lookup for a specific record becomes a query for any record matching a condition. The same path omits Ash.Query.limit(1), leaving Ash.read_one/2 able to distinguish no match from one match from several, which turns comparison predicates into an oracle for the lookup value. Authorization is unaffected; the destination read policy still applies. This issue affects ash: from 1.52.0-rc.11 before 3.31.1.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ash-project | ash | 1.52.0-rc.11 – before 3.31.1 |
| ash-project | ash | 571c138140e71cea24005189f45d7a63c8d2ed20 – before 09f42593035bceb0f6153dd7ee45cc49d108300a |
Weakness: CWE-943 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N