Vulnerability · Published Aug 30, 2026 · Assigned by EEF
CVE-2026-77454exists/2 predicate silently dropped on limited relationships with a parent() filter in AshSql
Medium 5.9
In plain English
A medium-severity incorrect authorization in ash_sql from ash-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
Official description
Incorrect Authorization vulnerability in ash-project ash_sql allows a caller to bypass a scoping or authorization filter expressed as exists/2 over a relationship that declares both a limit (or from_many?) and a parent(...)-referencing filter or sort. AshSql.Join.related_query/3 skips the caller-supplied exists predicate for such relationships and delegates it to limit_from_many/5. When the relationship's own filter or sort references parent(...), limit_from_many/5 takes a branch that drops both the limit and the predicate, emitting a bare correlated EXISTS with no predicate. The check then matches any record that has any related row. Most severely, when the expression backs a policy (for example authorize_if expr(exists(memberships, user_id == ^actor(:id)))), the actor-scoping condition disappears and the policy passes for any actor with any related row. This issue affects ash_sql: from 0.4.1 before 0.7.1.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ash-project | ash_sql | 0.4.1 – before 0.7.1 |
| ash-project | ash_sql | e26a63b29bd7501505fafd726f14262cdc3b6629 – before 865fdd4e5e70724a23b19c048e6768c31d2209ab |
Weakness: CWE-863 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/ash-project/ash_sql/security/advisories/GHSA-8v9m-8pxv-738c vendor-advisory, related
- https://cna.erlef.org/cves/CVE-2026-77454.html related
- https://osv.dev/vulnerability/EEF-CVE-2026-77454 related
- https://github.com/ash-project/ash_sql/commit/865fdd4e5e70724a23b19c048e6768c31d2209ab patch