CVE-2026-66838 (GCVE-0-2026-66838)
Vulnerability from cvelistv5 – Published: 2026-08-07 12:20 – Updated: 2026-08-07 15:12
VLAI
EPSS
VEX
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
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-07 15:11 UTC
CWE
- CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/elixir-ecto/ecto/security/advi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-66838.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-66838 | related |
| https://github.com/elixir-ecto/postgrex/commit/e1… | patch |
| https://github.com/elixir-ecto/postgrex/commit/40… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| elixir-ecto | postgrex |
Affected:
0.19.3 , < 0.22.4
(semver)
cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:* |
||
| elixir-ecto | postgrex |
Affected:
4971a2722fa72f8e1b54a2c403cad4c43916e36d , < *
(git)
cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:* |
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"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-66838\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-07T15:11:28.060095Z\"}}}], \"references\": [{\"url\": \"https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-07T15:12:07.776Z\"}}], \"cna\": {\"title\": \"SQL injection via the :comment option in Postgrex.stream/4\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"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\"}], \"impacts\": [{\"capecId\": \"CAPEC-66\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-66 SQL Injection\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 5.9, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"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\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/elixir-ecto/postgrex\", \"vendor\": \"elixir-ecto\", \"modules\": [\"\u0027Elixir.Postgrex\u0027\", \"\u0027Elixir.Postgrex.Protocol\u0027\"], \"product\": \"postgrex\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.19.3\", \"lessThan\": \"0.22.4\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/postgrex\", \"packageName\": \"postgrex\", \"programFiles\": [\"lib/postgrex.ex\", \"lib/postgrex/protocol.ex\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Postgrex\u0027:stream/4\"}, {\"name\": \"\u0027Elixir.Postgrex.Protocol\u0027:parse_describe_comment_msgs/3\"}]}, {\"cpes\": [\"cpe:2.3:a:elixir-ecto:postgrex:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/elixir-ecto/postgrex\", \"vendor\": \"elixir-ecto\", \"modules\": [\"\u0027Elixir.Postgrex\u0027\", \"\u0027Elixir.Postgrex.Protocol\u0027\"], \"product\": \"postgrex\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c\", \"status\": \"unaffected\"}, {\"at\": \"4011be852c99dc61ddb98cb01aa41e8775a0e3dd\", \"status\": \"unaffected\"}], \"version\": \"4971a2722fa72f8e1b54a2c403cad4c43916e36d\", \"lessThan\": \"*\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/elixir-ecto/postgrex\", \"packageName\": \"elixir-ecto/postgrex\", \"programFiles\": [\"lib/postgrex.ex\", \"lib/postgrex/protocol.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Postgrex\u0027:stream/4\"}, {\"name\": \"\u0027Elixir.Postgrex.Protocol\u0027:parse_describe_comment_msgs/3\"}]}], \"references\": [{\"url\": \"https://github.com/elixir-ecto/ecto/security/advisories/GHSA-3gww-3f36-2388\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-66838.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-66838\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/elixir-ecto/postgrex/commit/e1ecba618ddea4cee2556bd6ad9b6285e05f9d3c\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/elixir-ecto/postgrex/commit/4011be852c99dc61ddb98cb01aa41e8775a0e3dd\", \"tags\": [\"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eReject any \u003ccode\u003e:comment\u003c/code\u003e value containing \u003ccode\u003e*/\u003c/code\u003e or a null byte before passing it to \u003ccode\u003ePostgrex.stream/4\u003c/code\u003e or \u003ccode\u003eEcto.Repo.stream/2\u003c/code\u003e. Alternatively, build comments only from trusted values.\u003c/p\u003e\", \"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.\", \"base64\": false}]}], \"descriptions\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eImproper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027) vulnerability in elixir-ecto postgrex allows SQL Injection via the \u003ccode\u003e:comment\u003c/code\u003e option of \u003ccode\u003ePostgrex.stream/4\u003c/code\u003e. An attacker who can influence that value can close the comment delimiter with \u003ccode\u003e*/\u003c/code\u003e and extend the streamed statement with their own clauses, which execute under the connection\u0027s role. 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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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