Vulnerability-Lookup

CVE-2026-75513 (GCVE-0-2026-75513)

Vulnerability from cvelistv5 – Published: 2026-09-16 20:46 – Updated: 2026-09-19 01:55

Title

Marten: SQL injection in Marten's LINQ provider via unescaped string literals

Summary

Marten is a .NET Transactional Document DB and Event Store on PostgreSQL. From version 7.0.0 until 9.13.0, several Marten LINQ and tenant-management paths interpolate runtime, potentially attacker-controlled strings into single-quoted SQL literals without escaping or parameterization. The primary confirmed vector is a dictionary indexer key used by Where filters in src/Marten/Linq/Members/Dictionaries/DictionaryItemMember.cs. Additional affected sinks include SelectParser.cs, DatabaseScopedTenantPartitions.cs, and DeleteAllForTenant.cs reached through IEventStore.DeleteProjectionProgressAsync, while DictionaryContainsKeyFilter.cs (Newtonsoft serializer only; System.Text.Json is not affected) handles ContainsKey calls. Events/Daemon/Internals/EventLoader.cs contains a related per-tenant partition-pruning literal that the advisory identifies as a defense-in-depth sink. A crafted single quote can escape the generated literal, enabling filter or multi-tenant authorization bypass and blind data exfiltration, and deployments that permit semicolon-batched Npgsql statements may also allow data modification. This issue is fixed in version 9.13.0.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-19 01:54 UTC

CWE

CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/JasperFx/marten/security/advis…	x_refsource_CONFIRM
https://github.com/JasperFx/marten/pull/4911	x_refsource_MISC
https://github.com/JasperFx/marten/commit/61882d0…	x_refsource_MISC
https://github.com/JasperFx/marten/releases/tag/9.13.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
JasperFx	marten	Affected: >= 7.0.0, < 9.13.0	guessed

Show details on NVD website

JSON

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FKIE_CVE-2026-75513

Vulnerability from fkie_nvd - Published: 2026-09-16 21:17 - Updated: 2026-09-16 21:17

Severity

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/JasperFx/marten/commit/61882d0424854cb48703f08bdb246894ac576bed
	security-advisories@github.com	https://github.com/JasperFx/marten/pull/4911
	security-advisories@github.com	https://github.com/JasperFx/marten/releases/tag/9.13.0
	security-advisories@github.com	https://github.com/JasperFx/marten/security/advisories/GHSA-rfx3-98h7-v3xp

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "product": "marten",
          "vendor": "JasperFx",
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              "status": "affected",
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    }
  ],
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GHSA-RFX3-98H7-V3XP

Vulnerability from github – Published: 2026-09-17 14:51 – Updated: 2026-09-17 14:51

Summary

Marten's LINQ provider has SQL injection via unescaped string literals

Details

Several code paths in Marten's LINQ provider and tenant-management internals interpolated a runtime, potentially attacker-influenced value into generated SQL as a single-quoted string literal without escaping or parameterization. A value containing a single quote (') could break out of the literal and inject arbitrary SQL.

The primary vector is a Dictionary<,> indexer key used in a Where filter — Where(x => x.Attributes[key] == v) — a common "filter by attribute name" / EAV pattern. It is confirmed with an executed proof-of-concept and yields filter / multi-tenant authorization bypass (returning other tenants' rows) and blind data exfiltration. Where the application permits ;-batched statements (Npgsql default), data modification is also possible.

Affected sinks

Linq/Members/Dictionaries/DictionaryItemMember.cs — dictionary indexer key (primary, confirmed PoC)
Linq/Members/Dictionaries/DictionaryContainsKeyFilter.cs — Dictionary.ContainsKey(key) (Newtonsoft serializer only; System.Text.Json escapes the quote)
Linq/Parsing/SelectParser.cs — a constant string projected through Select(x => new { L = runtimeString })
Internal/Operations/DeleteAllForTenant.cs — tenant id reaching per-tenant projection teardown via IEventStore.DeleteProjectionProgressAsync (an in-code comment wrongly claimed the value was validated)
Schema/DatabaseScopedTenantPartitions.cs — tenant id inlined into FOR VALUES IN ('...') partition DDL
Events/Daemon/Internals/EventLoader.cs (defense-in-depth) — per-tenant partition-pruning literal

Proof of concept (primary vector)

Benign: x.Attributes["nonexistent-key"] == "v" returns 0 rows. Attack: x.Attributes["nonexistent' = '' or 1=1 --"] == "v" returns all rows. Generated SQL:

select d.data from public.mt_doc_doc as d where d.data -> 'Attributes' ->> 'x' or 1=1 --' = :p0;

Fix

Each sink now escapes embedded single quotes (.Replace("'", "''"), mirroring the existing Ordering.BuildNgramRankExpression) or binds the value as a parameter (DeleteAllForTenant). Where a literal is retained for partition pruning, escaping preserves plan-time pruning while closing the injection. Regression tests lock down each vector.

Workarounds

Until upgrading: do not pass untrusted input as a dictionary indexer key / ContainsKey argument / Select constant, nor as a tenant id into projection teardown or provisioning; and disable multi-statement command batching to limit blast radius.

Credit

Reported privately and responsibly by an external security researcher with an executed PoC. Additional sinks found during the follow-up LINQ-wide audit.

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 9.12.0"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Marten"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "9.13.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-75513"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-89"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-17T14:51:41Z",
    "nvd_published_at": "2026-09-16T21:17:13Z",
    "severity": "CRITICAL"
  },
  "details": "Several code paths in Marten\u0027s LINQ provider and tenant-management internals interpolated a runtime, potentially attacker-influenced value into generated SQL as a single-quoted string literal without escaping or parameterization. A value containing a single quote (`\u0027`) could break out of the literal and inject arbitrary SQL.\n\nThe primary vector is a `Dictionary\u003c,\u003e` indexer **key** used in a `Where` filter \u2014 `Where(x =\u003e x.Attributes[key] == v)` \u2014 a common \"filter by attribute name\" / EAV pattern. It is confirmed with an executed proof-of-concept and yields filter / multi-tenant authorization bypass (returning other tenants\u0027 rows) and blind data exfiltration. Where the application permits `;`-batched statements (Npgsql default), data modification is also possible.\n\n## Affected sinks\n\n- `Linq/Members/Dictionaries/DictionaryItemMember.cs` \u2014 dictionary indexer key (primary, confirmed PoC)\n- `Linq/Members/Dictionaries/DictionaryContainsKeyFilter.cs` \u2014 `Dictionary.ContainsKey(key)` (Newtonsoft serializer only; System.Text.Json escapes the quote)\n- `Linq/Parsing/SelectParser.cs` \u2014 a constant string projected through `Select(x =\u003e new { L = runtimeString })`\n- `Internal/Operations/DeleteAllForTenant.cs` \u2014 tenant id reaching per-tenant projection teardown via `IEventStore.DeleteProjectionProgressAsync` (an in-code comment wrongly claimed the value was validated)\n- `Schema/DatabaseScopedTenantPartitions.cs` \u2014 tenant id inlined into `FOR VALUES IN (\u0027...\u0027)` partition DDL\n- `Events/Daemon/Internals/EventLoader.cs` (defense-in-depth) \u2014 per-tenant partition-pruning literal\n\n## Proof of concept (primary vector)\n\nBenign: `x.Attributes[\"nonexistent-key\"] == \"v\"` returns 0 rows. Attack: `x.Attributes[\"nonexistent\u0027 = \u0027\u0027 or 1=1 --\"] == \"v\"` returns all rows. Generated SQL:\n\n```\nselect d.data from public.mt_doc_doc as d where d.data -\u003e \u0027Attributes\u0027 -\u003e\u003e \u0027x\u0027 or 1=1 --\u0027 = :p0;\n```\n\n## Fix\n\nEach sink now escapes embedded single quotes (`.Replace(\"\u0027\", \"\u0027\u0027\")`, mirroring the existing `Ordering.BuildNgramRankExpression`) or binds the value as a parameter (`DeleteAllForTenant`). Where a literal is retained for partition pruning, escaping preserves plan-time pruning while closing the injection. Regression tests lock down each vector.\n\n## Workarounds\n\nUntil upgrading: do not pass untrusted input as a dictionary indexer key / `ContainsKey` argument / `Select` constant, nor as a tenant id into projection teardown or provisioning; and disable multi-statement command batching to limit blast radius.\n\n## Credit\n\nReported privately and responsibly by an external security researcher with an executed PoC. Additional sinks found during the follow-up LINQ-wide audit.",
  "id": "GHSA-rfx3-98h7-v3xp",
  "modified": "2026-09-17T14:51:41Z",
  "published": "2026-09-17T14:51:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/JasperFx/marten/security/advisories/GHSA-rfx3-98h7-v3xp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75513"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JasperFx/marten/pull/4911"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JasperFx/marten/commit/61882d0424854cb48703f08bdb246894ac576bed"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/JasperFx/marten"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JasperFx/marten/releases/tag/9.13.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Marten\u0027s LINQ provider has SQL injection via unescaped string literals"
}

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.

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.
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Action not permitted

CVE-2026-75513 (GCVE-0-2026-75513)

FKIE_CVE-2026-75513

GHSA-RFX3-98H7-V3XP

Affected sinks

Proof of concept (primary vector)

Fix

Workarounds

Credit

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