---
id: CVE-2026-75513
title: Marten is a .NET Transactional Document DB and Event Store on PostgreSQL
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 SQ…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L'
cwe:
  - CWE-89
vendor: JasperFx
product: marten
affected:
  - 'marten >= 7.0.0, < 9.13.0'
patched:
  - Marten 9.13.0
published: '2026-09-16'
updated: '2026-09-19'
sourceUpdated: '2026-09-19T02:16:54.140'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75513'
references:
  - url: >-
      https://github.com/JasperFx/marten/commit/61882d0424854cb48703f08bdb246894ac576bed
    label: security-advisories@github.com
  - url: 'https://github.com/JasperFx/marten/pull/4911'
    label: security-advisories@github.com
  - url: 'https://github.com/JasperFx/marten/releases/tag/9.13.0'
    label: security-advisories@github.com
  - url: 'https://github.com/JasperFx/marten/security/advisories/GHSA-rfx3-98h7-v3xp'
    label: security-advisories@github.com
  - url: 'https://github.com/JasperFx/marten/security/advisories/GHSA-rfx3-98h7-v3xp'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75513'
  - url: 'https://github.com/advisories/GHSA-rfx3-98h7-v3xp'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - nuget
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-19T01:54:54.693812Z'
epss: 0.00468
epssPercentile: 0.37876
aliases:
  - GHSA-rfx3-98h7-v3xp
ecosystem: nuget
ingestedAt: '2026-09-16T21:05:36.878Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-75513)

Affected packages:

- `Marten >= 7.0.0, <= 9.12.0`

Patched in:

- `Marten 9.13.0`

Source: https://github.com/advisories/GHSA-rfx3-98h7-v3xp