CVE-2026-70395
Predicate injection in manage_relationship belongs_to lookup discloses secret lookup keys in Ash
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.
INFO
Published Date :
Aug. 9, 2026, 7:17 p.m.
Last Modified :
Aug. 9, 2026, 7:17 p.m.
Remotely Exploit :
No
Source :
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | LOW | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | ||||
| CVSS 4.0 | LOW | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db |
Solution
- Update ash to 3.31.1 or later.
- Ensure all lookups are properly cast.
- Validate filter predicates carefully.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-70395.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-70395 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-70395
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-70395 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-70395 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Aug. 09, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/ash-project/ash', 'vendor': 'ash-project', 'modules': ["'Elixir.Ash.Actions.ManagedRelationships'", "'Elixir.Ash.Changeset'"], 'product': 'ash', 'versions': [{'status': 'affected', 'version': '1.52.0-rc.11', 'lessThan': '3.31.1', 'versionType': 'semver'}], 'packageURL': 'pkg:hex/ash', 'packageName': 'ash', 'programFiles': ['lib/ash/actions/managed_relationships.ex', 'lib/ash/changeset/changeset.ex'], 'collectionURL': 'https://repo.hex.pm', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.Ash.Actions.ManagedRelationships':setup_managed_belongs_to_relationships/3"}, {'name': "'Elixir.Ash.Changeset':manage_relationship/4"}]}, {'cpes': ['cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/ash-project/ash', 'vendor': 'ash-project', 'modules': ["'Elixir.Ash.Actions.ManagedRelationships'", "'Elixir.Ash.Changeset'"], 'product': 'ash', 'versions': [{'status': 'affected', 'version': '571c138140e71cea24005189f45d7a63c8d2ed20', 'lessThan': '09f42593035bceb0f6153dd7ee45cc49d108300a', 'versionType': 'git'}], 'packageURL': 'pkg:github/ash-project/ash', 'packageName': 'ash-project/ash', 'programFiles': ['lib/ash/actions/managed_relationships.ex', 'lib/ash/changeset/changeset.ex'], 'collectionURL': 'https://github.com', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.Ash.Actions.ManagedRelationships':setup_managed_belongs_to_relationships/3"}, {'name': "'Elixir.Ash.Changeset':manage_relationship/4"}]}] Added 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. Added CVSS V4.0 AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-943 Added Reference https://cna.erlef.org/cves/CVE-2026-70395.html Added Reference https://github.com/ash-project/ash/commit/09f42593035bceb0f6153dd7ee45cc49d108300a Added Reference https://github.com/ash-project/ash/security/advisories/GHSA-vvp6-3wv6-833j Added Reference https://osv.dev/vulnerability/EEF-CVE-2026-70395