{"id":"CVE-2026-82738","summary":"Ash.Type.UUIDv7 accepts non-v7 UUIDs that then fail to load, causing persistent denial of service","details":"Improper 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\nAsh.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":["EEF-CVE-2026-82738","GHSA-7xfw-9jwm-9c4c"],"modified":"2026-10-28T02:31:14.364473860Z","published":"2026-09-01T03:26:23.035Z","database_specific":{"cna_assigner":"EEF","cwe_ids":["CWE-20"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82738.json"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82738.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-82738"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82738.json"},{"type":"ADVISORY","url":"https://github.com/ash-project/ash/security/advisories/GHSA-7xfw-9jwm-9c4c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82738"},{"type":"FIX","url":"https://github.com/ash-project/ash/commit/c453cdc0b8570e86ffef0d10e136247f52b3ea76"},{"type":"PACKAGE","url":"https://github.com/ash-project/ash"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash","events":[{"introduced":"751d8a4d11564efbe358c90c8347f3a00eb60782"},{"fixed":"c453cdc0b8570e86ffef0d10e136247f52b3ea76"},{"introduced":"2afa4b503f68edceacfeb7f908155d3dda89dbab"},{"fixed":"c4505a40d1f28ddb6a82fa7c12955d511f01d479"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"751d8a4d11564efbe358c90c8347f3a00eb60782"},{"fixed":"c453cdc0b8570e86ffef0d10e136247f52b3ea76"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"strategy":"StandardRange","range":[{"introduced":"3.6.3"},{"fixed":"3.32.2"}],"source":"AFFECTED_FIELD"},{"source":"REFERENCES_COMMIT","range":[{"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://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82738.json"}}],"schema_version":"1.9.2","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"}]}