CVE-2026-69659: Ash-Hq Ash Framework

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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

• Ash-Hq Ash Framework: from 1.17.0, before 3.31.1 (fixed in 3.31.1)

Published 2026-08-09. Last modified 2026-08-18.