CVE-2026-66838 (GCVE-0-2026-66838)

Vulnerability from cvelistv5 – Published: 2026-08-07 12:20 – Updated: 2026-08-07 15:12
VLAI
Title
SQL injection via the :comment option in Postgrex.stream/4
Summary
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.
Severity
5.9 (Medium)
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
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Assigner
EEF
References
Impacted products
Vendor Product Version
elixir-ecto postgrex Affected: 0.19.3 , < 0.22.4 (semver)
    cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*
 Create a notification for this product.
elixir-ecto postgrex Affected: 4971a2722fa72f8e1b54a2c403cad4c43916e36d , < * (git)
    cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
Snehil Shah José Valim Jonatan Männchen / EEF
Show details on NVD website
To clipboard 

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Ecto exposes the same option through \u003ccode\u003eEcto.Repo.stream/2\u003c/code\u003e.\u003c/p\u003e\\n\u003cp\u003ePostgrex appends the comment by concatenating it into the statement text sent in the \u003ccode\u003eParse\u003c/code\u003e message, without escaping or rejecting \u003ccode\u003e*/\u003c/code\u003e. The option is validated by \u003ccode\u003ecomment_not_present!/1\u003c/code\u003e at every other execution point; \u003ccode\u003estream/4\u003c/code\u003e never calls it. Because \u003ccode\u003eParse\u003c/code\u003e accepts a single command, the injection is confined to the streamed statement and further statements cannot be chained.\u003c/p\u003e\\n\u003cp\u003eThis issue affects postgrex: from 0.19.3 before 0.22.4.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027) 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\u0027s 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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-89\", \"description\": \"CWE-89 Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027)\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe application must pass a \u003ccode\u003e:comment\u003c/code\u003e derived from untrusted input to \u003ccode\u003ePostgrex.stream/4\u003c/code\u003e or \u003ccode\u003eEcto.Repo.stream/2\u003c/code\u003e. Applications that omit the option or pass only static values are unaffected.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"The 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.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.22.4\", \"versionStartIncluding\": \"0.19.3\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-07T12:20:02.376Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-66838\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-07T15:12:12.308Z\", \"dateReserved\": \"2026-08-06T14:00:01.865Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-07T12:20:02.376Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.