{"id":"EEF-CVE-2026-82738","summary":"Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of service","details":"## Summary\n\nImproper Input Validation vulnerability in ash-project ash allows an attacker to persistently deny reads of a record by storing a non-version-7 UUID in an `Ash.Type.UUIDv7` attribute.\n\n`Ash.Type.UUIDv7.cast_input/2` accepts any well-formed UUID string, including non-version-7 UUIDs, and stores it as a 16-byte binary. On read, `cast_stored/2` (`lib/ash/type/uuid_v7.ex`) routes the stored binary back through `cast_input/2`, which since an input-validation tightening in v3.6.3 matches only version-7 (and optionally version-4) 16-byte binaries and otherwise expects a 36-character string. A stored non-v7 16-byte binary matches neither clause and returns `:error`, so every later read of that record fails. An attacker able to set such an attribute poisons the row permanently. The fix decodes any 16-byte stored binary directly in `cast_stored/2`.\n\nThis issue affects ash: from 3.6.3 before 3.32.2.","aliases":["CVE-2026-82738","GHSA-7xfw-9jwm-9c4c"],"modified":"2026-09-08T03:45:07.705451927Z","published":"2026-09-01T03:26:23.035Z","database_specific":{"cpe_ids":["cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-20"],"capec_ids":["CAPEC-153"]},"references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash/security/advisories/GHSA-7xfw-9jwm-9c4c"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82738.html"},{"type":"FIX","url":"https://github.com/ash-project/ash/commit/c453cdc0b8570e86ffef0d10e136247f52b3ea76"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash"}],"affected":[{"package":{"name":"ash","ecosystem":"Hex","purl":"pkg:hex/ash"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.6.3"},{"fixed":"3.32.2"}]}],"versions":["3.10.0","3.10.1","3.11.0","3.11.1","3.11.2","3.11.3","3.12.0","3.13.0","3.13.1","3.13.2","3.14.0","3.14.1","3.15.0","3.16.0","3.17.0","3.17.1","3.18.0","3.19.0","3.19.1","3.19.2","3.19.3","3.20.0","3.21.0","3.21.1","3.21.2","3.21.3","3.22.0","3.22.1","3.22.2","3.23.0","3.23.1","3.24.0","3.24.1","3.24.2","3.24.3","3.24.4","3.24.5","3.24.6","3.24.7","3.25.0","3.25.1","3.25.2","3.26.0","3.27.0","3.27.1","3.27.2","3.27.3","3.27.4","3.27.5","3.27.6","3.27.7","3.27.8","3.28.0","3.29.0","3.29.1","3.29.2","3.29.3","3.30.0","3.30.1","3.31.0","3.31.1","3.31.2","3.31.3","3.32.0","3.32.1","3.6.3","3.7.0","3.7.1","3.7.2","3.7.3","3.7.4","3.7.5","3.7.6","3.8.0","3.9.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-82738.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash","events":[{"introduced":"751d8a4d11564efbe358c90c8347f3a00eb60782"},{"fixed":"c453cdc0b8570e86ffef0d10e136247f52b3ea76"}]}],"versions":["v3.32.1","v3.31.3","v3.31.2","v3.31.1","v3.31.0","v3.30.1","v3.30.0","v3.29.3","v3.29.2","v3.29.1","v3.29.0","v3.28.0","v3.27.8","v3.27.7","v3.27.6","v3.27.4","v3.27.3","v3.27.2","v3.27.1","v3.27.0","v3.26.0","v3.25.2","v3.25.1","v3.25.0","v3.24.7","v3.24.6","v3.24.5","v3.24.4","v3.24.3","v3.24.2","v3.24.1","v3.24.0","v3.23.1","v3.23.0","v3.22.2","v3.22.1","v3.22.0","v3.21.3","v3.21.2","v3.21.1","v3.21.0","v3.20.0","v3.19.3","v3.19.2","v3.19.1","v3.19.0","v3.18.0","v3.17.1","v3.17.0","v3.16.0","v3.15.0","v3.14.1","v3.14.0","v3.13.2","v3.13.1","v3.13.0","v3.12.0","v3.11.3","v3.11.2","v3.11.1","v3.11.0","v3.10.1","v3.10.0","v3.9.0","v3.8.0","v3.7.6","v3.7.5","v3.7.4","v3.7.3","v3.7.2","v3.7.1","v3.7.0","v3.6.3"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-82738.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}],"credits":[{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"},{"name":"Zach Daniel / Ash Project","type":"REMEDIATION_DEVELOPER"},{"name":"Peter Ullrich","type":"REPORTER"},{"name":"Peter Ullrich","type":"FINDER"}]}