JasperFx Marten up to 9.12.x Linq Dictionary Member DictionaryItemMember.cs sql injection

Summaryinfo

A vulnerability has been found in JasperFx Marten up to 9.12.x and classified as critical. Affected by this issue is some unknown functionality of the file src/Marten/Linq/Members/Dictionaries/DictionaryItemMember.cs of the component Linq Dictionary Member. Performing a manipulation results in sql injection. This vulnerability was named CVE-2026-75513. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in JasperFx Marten up to 9.12.x. This affects an unknown part of the file src/Marten/Linq/Members/Dictionaries/DictionaryItemMember.cs of the component Linq Dictionary Member. The manipulation with an unknown input leads to a sql injection vulnerability. CWE is classifying the issue as CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-75513 since 08/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1505 according to MITRE ATT&CK.

Upgrading to version 9.13.0 eliminates this vulnerability.

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Productinfo

Type

• Programming Tool Software

Vendor

• JasperFx

Name

• Marten

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.12

Website

• Product: https://github.com/JasperFx/marten/

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