CVE-2026-75513
No CISA KEV listing is included in this saved record. Exploitation may still have occurred.
FIRST EPSS: 0.47 % · percentile 40.99 % · scored 12 Nov 2026.
Saved 12 Nov 2026 18:18:51 UTC · View this risk record (JSON)
CVE-2026-75513
Marten: SQL injection in Marten's LINQ provider via unescaped string literals
CVSS 3.1 9.1 CRITICALEUVD CVSS 3.1 9.1 CVSS 3.1 · [email protected] · Secondary 9.1 CRITICALCVSS_V3 Publisher rating CRITICALFixed by Marten 8.37.4Fixed by Marten 9.13.0KEV status unknown
cve-program · CVE-2026-75513
PublishedMarten 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.
Read the publisher's advisoryeuvd · EUVD-2026-81263
PublishedMarten 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.
Read the publisher's advisorynvd · CVE-2026-75513
PublishedMarten 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.
Read the publisher's advisoryosv · GHSA-rfx3-98h7-v3xp
PublishedSeveral 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.
Read the publisher's advisoryAffected versions, risk and source history
Exploitation and risk
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cve-program · CVE-2026-75513
PublishedMarten: SQL injection in Marten's LINQ provider via unescaped string literals
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.
- Source published
- 16 Sep 2026 20:46:17 UTC
- Source modified
- 19 Sep 2026 01:55:24 UTC
- Saved here
- 23 Oct 2026 15:48:27 UTC
- Source terms
- CVE Program Terms of Use
Original source record · Cite this exact observation · Complete original publisher JSON
Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS 3.1 · 9.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
euvd · EUVD-2026-81263
PublishedMarten 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 l…
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.
Additional publisher context
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
Original publisher date fields
datePublished: Sep 16, 2026, 8:46:17 PM
dateUpdated: Sep 19, 2026, 1:55:24 AM
- Source published
- Sep 16, 2026, 8:46:17 PM (timezone not stated)
- Source modified
- Sep 19, 2026, 1:55:24 AM (timezone not stated)
- Saved here
- 11 Nov 2026 16:06:55 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
Original source record · Cite this exact observation · Complete original publisher JSON
Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
EUVD CVSS 3.1 · 9.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
nvd · CVE-2026-75513
PublishedMarten 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 l…
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.
Additional publisher context
NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.
Source analysis status: Deferred
Weakness classifications: CWE-89
Original publisher date fields
published: 2026-09-16T21:17:13.440
lastModified: 2026-09-19T02:16:54.140
- Source published
- 16 Sep 2026 21:17:13 UTC
- Source modified
- 19 Sep 2026 02:16:54 UTC
- Saved here
- 25 Oct 2026 15:19:09 UTC
- Source terms
- NIST NVD usage terms; underlying source attribution retained
Original source record · Cite this exact observation · Complete original publisher JSON
Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS 3.1 · [email protected] · Secondary · 9.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
osv · GHSA-rfx3-98h7-v3xp
PublishedMarten's LINQ provider has SQL injection via unescaped string literals
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.
- Source published
- 17 Sep 2026 14:51:41 UTC
- Source modified
- 9 Nov 2026 16:46:31 UTC
- Saved here
- 9 Nov 2026 18:02:17 UTC
- Source terms
- GitHub Advisory Database · CC-BY-4.0
Original source record · Cite this exact observation · Complete original publisher JSON
Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
Publisher rating · CRITICAL