Vulnerability · Published Aug 9, 2026 · Assigned by EEF
CVE-2026-69659Memory exhaustion via unbounded deserialization of keyset pagination cursors in Ash.Page.Keyset
Medium 5.9
In plain English
A medium-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 0.4% (higher than 30% of all known vulnerabilities).
Official description
Uncontrolled Resource Consumption vulnerability in ash-project ash allows an attacker to exhaust the memory of the node via a crafted keyset pagination cursor. Read actions with keyset pagination deserialize the client-supplied page[:after] or page[:before] cursor in decode_values/2 in lib/ash/page/keyset.ex, which base64-decodes the value and passes it to :erlang.binary_to_term/2 without bounding its size. The Erlang external term format supports zlib-compressed payloads, which the decoder inflates transparently, so a cursor of a few kilobytes can allocate tens of megabytes of heap in a single call. Ash itself only ever encodes cursors uncompressed, so the decoder accepts a term shape its encoder never produces. Concurrent requests aggregate these allocations and can terminate the node. This issue affects ash: from 1.17.0 before 3.31.1.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ash-project | ash | 1.17.0 – before 3.31.1 |
| ash-project | ash | f8fadc67e67c955bb68b3a8d642be13e2b7e8ca9 – before 1816b103af975221210478d61db20adcea700319 |
Weakness: CWE-502 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N