{"affected":[{"package":{"ecosystem":"Hex","name":"postgrex","purl":"pkg:hex/postgrex"},"ranges":[{"events":[{"introduced":"0.19.3"},{"fixed":"0.22.4"}],"type":"SEMVER"}],"versions":["0.19.3","0.20.0","0.21.0","0.21.1","0.22.0","0.22.1","0.22.2","0.22.3"]},{"ranges":[{"events":[{"introduced":"4971a2722fa72f8e1b54a2c403cad4c43916e36d"},{"fixed":"e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c"},{"fixed":"4011be852c99dc61ddb98cb01aa41e8775a0e3dd"}],"repo":"https://github.com/elixir-ecto/postgrex","type":"GIT"}]}],"aliases":["GHSA-3gww-3f36-2388","CVE-2026-66838"],"credits":[{"name":"Snehil Shah","type":"FINDER"},{"name":"José Valim","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"ANALYST"}],"database_specific":{"capec_ids":["CAPEC-66"],"cpe_ids":["cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-89"]},"details":"## Summary\n\nImproper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in elixir-ecto postgrex allows SQL Injection via the :comment option of Postgrex.stream/4. An attacker who can influence that value can close the comment delimiter with \\*/ and extend the streamed statement with their own clauses, which execute under the connection's role. Ecto exposes the same option through Ecto.Repo.stream/2.\n\nPostgrex appends the comment by concatenating it into the statement text sent in the Parse message, without escaping or rejecting \\*/. The option is validated by comment\\_not\\_present!/1 at every other execution point; stream/4 never calls it. Because Parse accepts a single command, the injection is confined to the streamed statement and further statements cannot be chained.\n\nThis issue affects postgrex: from 0.19.3 before 0.22.4.\n\n## Workaround\n\nReject any :comment value containing \\*/ or a null byte before passing it to Postgrex.stream/4 or Ecto.Repo.stream/2. Alternatively, build comments only from trusted values.\n\n## Configuration\n\nThe application must pass a :comment derived from untrusted input to Postgrex.stream/4 or Ecto.Repo.stream/2. Applications that omit the option or pass only static values are unaffected.","id":"EEF-CVE-2026-66838","modified":"2026-08-07T12:20:02.847754Z","published":"2026-08-07T12:20:02.376Z","references":[{"type":"ADVISORY","url":"https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-66838.html"},{"type":"FIX","url":"https://github.com/elixir-ecto/postgrex/commit/e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c"},{"type":"FIX","url":"https://github.com/elixir-ecto/postgrex/commit/4011be852c99dc61ddb98cb01aa41e8775a0e3dd"},{"type":"PACKAGE","url":"https://hex.pm/packages/postgrex"}],"related":[],"schema_version":"1.7.3","severity":[{"score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"}],"summary":"SQL injection via the :comment option in Postgrex.stream/4","upstream":[]}