Vulnerability · Published Aug 12, 2026 · Assigned by EEF
CVE-2026-67579Filter expression injection via forged keyset pagination cursor in Ash
High 7.5
In plain English
A high-severity unsafe deserialization in ash from ash-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Official description
Deserialization of Untrusted Data vulnerability in ash-project ash allows an unauthenticated attacker to inject a filter expression through a forged keyset pagination cursor, resulting in SQL injection or code execution depending on the data layer. Read actions with keyset pagination decode the client-supplied page[:after] or page[:before] cursor in decode_values/2 in lib/ash/page/keyset.ex using non_executable_binary_to_term/2 with [:safe]. That guard blocks new atoms, funs, and ports, but not a struct built from atoms already interned in a running Ash application, so a decoded %Ash.Query.Call{} expression survives and is spliced into the keyset filter as a comparison value in do_filters/4 and evaluated. Because the cursor bypasses the Ash.Expr macro, the runtime never applies the private?/public? gate that would otherwise reject it. On AshPostgres the injected fragment is inlined into the SQL query; on the ETS and Simple data layers it is evaluated in-process as an arbitrary function call. This issue affects ash: from 1.17.0 before 3.31.3.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ash-project | ash | 1.17.0 – before 3.31.3 |
| ash-project | ash | f8fadc67e67c955bb68b3a8d642be13e2b7e8ca9 – before 91874dd5435bc0ffebd8a254acfa573b39b74520 |
Weakness: CWE-502, CWE-89 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N