Low
Predicate injection in manage_relationship belongs_to lookup discloses secret lookup keys in Ash
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-70395
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 13:23 UTC · Revision 1
Source evidence
Predicate injection in manage_relationship belongs_to lookup discloses secret lookup keys in Ash
core-osv · Original sourcePublished 9 Aug 2026, 18:17 UTC
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.
osv:CVE-2026-70395
Complete source record
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"id": "5588268eeacdaae913e53ac86fc2de42811f49ec09d968552241b1815b17a0b1",
"url": "https://osv.dev/vulnerability/CVE-2026-70395",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Predicate injection in manage_relationship belongs_to lookup discloses secret lookup keys in Ash",
"summary": "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.",
"evidence": "osv:CVE-2026-70395",
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],
"modified": "2026-10-28T02:30:28.878548455Z",
"provider": "osv",
"references": [
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"https://github.com",
"https://osv.dev/vulnerability/EEF-CVE-2026-70395",
"https://repo.hex.pm",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70395.json",
"https://github.com/ash-project/ash/security/advisories/GHSA-vvp6-3wv6-833j",
"https://nvd.nist.gov/vuln/detail/CVE-2026-70395",
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"https://github.com/ash-project/ash"
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],
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}
},
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 495838,
"published_at": "2026-08-09T18:17:07.321+00:00"
}