CVE-2026-75513Marten: SQL injection in Marten's LINQ provider via unescaped string literals

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

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