{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66838", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-08-06T14:00:01.865Z", "datePublished": "2026-08-07T12:20:02.376Z", "dateUpdated": "2026-08-07T12:20:02.376Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Postgrex'", "'Elixir.Postgrex.Protocol'"], "packageName": "postgrex", "packageURL": "pkg:hex/postgrex", "product": "postgrex", "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", "vendor": "elixir-ecto", "versions": [{"lessThan": "0.22.4", "status": "affected", "version": "0.19.3", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Postgrex'", "'Elixir.Postgrex.Protocol'"], "packageName": "elixir-ecto/postgrex", "packageURL": "pkg:github/elixir-ecto/postgrex", "product": "postgrex", "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", "vendor": "elixir-ecto", "versions": [{"changes": [{"at": "e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c", "status": "unaffected"}, {"at": "4011be852c99dc61ddb98cb01aa41e8775a0e3dd", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "4971a2722fa72f8e1b54a2c403cad4c43916e36d", "versionType": "git"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The application must pass a <code>:comment</code> derived from untrusted input to <code>Postgrex.stream/4</code> or <code>Ecto.Repo.stream/2</code>. Applications that omit the option or pass only static values are unaffected.</p>"}, {"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."}], "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."}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.22.4", "versionStartIncluding": "0.19.3", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Snehil Shah"}, {"lang": "en", "type": "remediation developer", "value": "Jos\u00e9 Valim"}, {"lang": "en", "type": "analyst", "value": "Jonatan M\u00e4nnchen / EEF"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in elixir-ecto postgrex allows SQL Injection via the <code>:comment</code> option of <code>Postgrex.stream/4</code>. An attacker who can influence that value can close the comment delimiter with <code>*/</code> and extend the streamed statement with their own clauses, which execute under the connection's role. Ecto exposes the same option through <code>Ecto.Repo.stream/2</code>.</p>\n<p>Postgrex appends the comment by concatenating it into the statement text sent in the <code>Parse</code> message, without escaping or rejecting <code>*/</code>. The option is validated by <code>comment_not_present!/1</code> at every other execution point; <code>stream/4</code> never calls it. Because <code>Parse</code> accepts a single command, the injection is confined to the streamed statement and further statements cannot be chained.</p>\n<p>This issue affects postgrex: from 0.19.3 before 0.22.4.</p>"}, {"base64": false, "type": "text/markdown", "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."}], "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."}], "impacts": [{"capecId": "CAPEC-66", "descriptions": [{"lang": "en", "value": "CAPEC-66 SQL Injection"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "baseScore": 5.9, "baseSeverity": "MEDIUM", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-89", "description": "CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-08-07T12:20:02.376Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-66838.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66838"}, {"tags": ["patch"], "url": "https://github.com/elixir-ecto/postgrex/commit/e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c"}, {"tags": ["patch"], "url": "https://github.com/elixir-ecto/postgrex/commit/4011be852c99dc61ddb98cb01aa41e8775a0e3dd"}], "source": {"discovery": "EXTERNAL"}, "title": "SQL injection via the :comment option in Postgrex.stream/4", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Reject any <code>:comment</code> value containing <code>*/</code> or a null byte before passing it to <code>Postgrex.stream/4</code> or <code>Ecto.Repo.stream/2</code>. Alternatively, build comments only from trusted values.</p>"}, {"base64": false, "type": "text/markdown", "value": "Reject 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."}], "value": "Reject 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."}]}}}

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