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CVE-2026-66838

Full vulnerability record from the local CVENow database.

Description

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
MEDIUM
CVSS score
5.9 (v4.0)
Vulnerability status
Analyzed
Source identifier
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published
2026-08-07 13:16:52.960000
Last modified
2026-10-24 16:10:00.153000
View original CVE JSON 
{
  "id": "CVE-2026-66838",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-08-07T13:16:52.960",
  "lastModified": "2026-10-24T16:10:00.153",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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.\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."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de Neutralización Incorrecta de Elementos Especiales utilizados en un Comando SQL (’inyección SQL’) en elixir-ecto postgrex permite la inyección SQL a través de la opción :comment de Postgrex.stream/4. Un atacante que puede influir en ese valor puede cerrar el delimitador de comentario con */ y extender la declaración transmitida con sus propias cláusulas, las cuales se ejecutan bajo el rol de la conexión. Ecto expone la misma opción a través de Ecto.Repo.stream/2.\n\nPostgrex añade el comentario concatenándolo en el texto de la declaración enviado en el mensaje Parse, sin escapar o rechazar */. La opción es validada por comment_not_present!/1 en cualquier otro punto de ejecución; stream/4 nunca la llama. Debido a que Parse acepta un solo comando, la inyección se limita a la declaración transmitida y no se pueden encadenar declaraciones adicionales.\n\nEste problema afecta a postgrex: desde 0.19.3 antes de 0.22.4."
    }
  ],
  "affected": [
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      "affectedData": [
        {
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          "product": "postgrex",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.hex.pm",
          "packageName": "postgrex",
          "cpes": [
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          "modules": [
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            "'Elixir.Postgrex.Protocol'"
          ],
          "programFiles": [
            "lib/postgrex.ex",
            "lib/postgrex/protocol.ex"
          ],
          "programRoutines": [
            {
              "name": "'Elixir.Postgrex':stream/4"
            },
            {
              "name": "'Elixir.Postgrex.Protocol':parse_describe_comment_msgs/3"
            }
          ],
          "repo": "https://github.com/elixir-ecto/postgrex",
          "packageURL": "pkg:hex/postgrex",
          "versions": [
            {
              "version": "0.19.3",
              "lessThan": "0.22.4",
              "versionType": "semver",
              "status": "affected"
            }
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        },
        {
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          "product": "postgrex",
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          "collectionURL": "https://github.com",
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          "programFiles": [
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          "programRoutines": [
            {
              "name": "'Elixir.Postgrex':stream/4"
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            {
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            }
          ],
          "repo": "https://github.com/elixir-ecto/postgrex",
          "packageURL": "pkg:github/elixir-ecto/postgrex",
          "versions": [
            {
              "version": "4971a2722fa72f8e1b54a2c403cad4c43916e36d",
              "lessThan": "*",
              "versionType": "git",
              "status": "affected",
              "changes": [
                {
                  "at": "e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c",
                  "status": "unaffected"
                },
                {
                  "at": "4011be852c99dc61ddb98cb01aa41e8775a0e3dd",
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  ],
  "metrics": {
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          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
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          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
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    "cvssMetricV31": [
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          "role": "CISA Coordinator",
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  "weaknesses": [
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      "description": [
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  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-66838.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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}