{"id":"EEF-CVE-2026-66838","summary":"SQL injection via the :comment option in Postgrex.stream/4","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## Workarounds\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## Configurations\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.","aliases":["CVE-2026-66838","GHSA-3gww-3f36-2388"],"modified":"2026-09-08T08:30:06.128089302Z","published":"2026-08-07T12:20:02.376Z","database_specific":{"cpe_ids":["cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-89"],"capec_ids":["CAPEC-66"]},"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"}],"affected":[{"package":{"name":"postgrex","ecosystem":"Hex","purl":"pkg:hex/postgrex"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.19.3"},{"fixed":"0.22.4"}]}],"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"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-66838.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/elixir-ecto/postgrex","events":[{"introduced":"4971a2722fa72f8e1b54a2c403cad4c43916e36d"},{"fixed":"e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c"},{"fixed":"4011be852c99dc61ddb98cb01aa41e8775a0e3dd"}]}],"versions":["v0.22.2","v0.22.1","v0.21.1","v0.21.0","v0.20.0","v0.19.3"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-66838.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:H/VI:L/VA:N/SC:N/SI:N/SA:N"}],"credits":[{"name":"Snehil Shah","type":"FINDER"},{"name":"José Valim","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"ANALYST"}]}