---
cve: "CVE-2026-75513"
severity: "CRITICAL"
cvss: 9.1
epss: "56.6%"
vendor: "JasperFx"
kev: false
exploited: false
published: "2026-09-16 21:17:13"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T21:58:13+02:00"
---

# CVE-2026-75513

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- a61ef90b210ab7981be7f622406e1c3e39fcc0f0 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-75513) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_