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EUVD-2026-335871

2026-10-15T03:04:13.504533+00:00

EUVD-2026-335871

fkie_cve-2026-55405

2026-10-15T03:04:13.504561+00:00

LangChain4j is a Java library for building LLM-powered applications on the JVM. Prior to 1.2.1-beta8, 1.5.1-beta11, 1.11.8-beta19, and 1.16.3-beta26, the MariaDB and pgvector embedding stores build metadata-filter SQL by string-concatenating filter keys, and in MariaDB string values, directly into the query without adequate escaping. A crafted metadata key in EmbeddingSearchRequest.filter() can break out of its SQL context and inject arbitrary SQL into the statements executed by the stores' search and removeAll(Filter) operations, enabling blind data exfiltration, denial of service via sleep functions, and deletion of arbitrary rows through removeAll(Filter). This issue is fixed in langchain4j-mariadb and langchain4j-pgvector versions 1.2.1-beta8, 1.5.1-beta11, 1.11.8-beta19, and 1.16.3-beta26.

GHSA-2mfg-cc43-9pcj — LangChain4j: SQL injection via metadata filters in langchain4j-mariadb and langchain4j-pgvector

2026-10-15T03:04:13.504595+00:00

Affected: Maven: dev.langchain4j:langchain4j-mariadb, Maven: dev.langchain4j:langchain4j-pgvector

### Summary The MariaDB and pgvector embedding stores build metadata-filter SQL by string-concatenating filter **keys** (and, in MariaDB, string **values**) directly into the query without adequate escaping. A crafted metadata key in `EmbeddingSearchRequest.filter()` can break out of its SQL context and inject arbitrary SQL into the statements executed by the stores' search and `removeAll(Filter)` operations.

### Details **pgvector — JSON mode (default, `COMBINED_JSON` / `COMBINED_JSONB`).** `JSONFilterMapper` places the key inside a single-quoted SQL literal (the JSON key of the `->>` operator) with no escaping:

(metadata->>'')::text

A key containing a single quote breaks out, e.g. `metadataKey("')::text IS NOT NULL OR pg_sleep(1) IS NOT NULL --")` injects a live `pg_sleep(1)` (observable as a delay; exploitable for blind data extraction).

**pgvector — column mode (`COLUMN_PER_KEY`).** `ColumnFilterMapper` used the key as a bare, unquoted, unvalidated SQL identifier (`::`), so a key such as `1=1 OR true --` injects directly.

**MariaDB — JSON mode (default).** `JSONFilterMapper` placed the key inside the JSON path literal `'$.'` unescaped (same break-out mechanism). Additionally, `MariaDbFilterMapper.formatValue()` escaped `'` but not `\`; because MariaDB treats backslash as an escape character by default, a string value ending in a backslash could also break out of its literal.

**MariaDB — column mode (`COLUMN_PER_KEY`).** `ColumnFilterMapper`…