Vulnerability Details CVE-2026-66838
Improper 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.
Postgrex 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.
This issue affects postgrex: from 0.19.3 before 0.22.4.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 5.6%
CVSS Severity
CVSS v3 Score 8.2
References
- https://cna.erlef.org/cves/CVE-2026-66838.html
- https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388
- https://github.com/elixir-ecto/postgrex/commit/4011be852c99dc61ddb98cb01aa41e8775a0e3dd
- https://github.com/elixir-ecto/postgrex/commit/e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c
- https://osv.dev/vulnerability/EEF-CVE-2026-66838
- https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388
Products affected by CVE-2026-66838
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cpe:2.3:a:elixir-ecto:postgrex:0.19.3
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cpe:2.3:a:elixir-ecto:postgrex:0.20.0
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cpe:2.3:a:elixir-ecto:postgrex:0.21.0
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cpe:2.3:a:elixir-ecto:postgrex:0.21.1
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cpe:2.3:a:elixir-ecto:postgrex:0.22.0
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cpe:2.3:a:elixir-ecto:postgrex:0.22.1
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cpe:2.3:a:elixir-ecto:postgrex:0.22.2