CVE-2026-76240 in stigmem
Summary
by MITRE • 08/19/2026
stigmem-node 0.9.0a1 interpolates Postgres backend schema identifiers into SQL strings without defensive quoting. In the affected code path the schema value is operator-controlled, but the unsafe pattern could allow SQL injection if a schema name were derived from tenant, request, or user input. Fixed in 0.9.0a2, which adds identifier quoting and validation. As a workaround, only configure schema names from trusted deployment configuration.
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Analysis
by VulDB Data Team • 08/19/2026
The vulnerability identified in stigmem-node versions prior to 0.9.0a1 represents a critical SQL injection flaw rooted in the improper handling of database schema identifiers within PostgreSQL backend interactions. The core technical deficiency lies in the interpolation of these schema identifiers directly into SQL query strings without applying necessary defensive quoting or escaping mechanisms. In standard secure coding practices, while input parameters for data values require parameterization to prevent injection attacks, structural elements such as table names, column names, and database schemas must be carefully validated and quoted using identifier-specific delimiters appropriate for the target database system. The absence of this safeguard in stigmem-node creates a direct pathway for attackers to manipulate SQL commands if they can influence the schema name used during query construction.
Although the specific code path affected by this vulnerability currently utilizes operator-controlled values rather than directly accepting user input, the architectural design flaw remains significant because it establishes an unsafe pattern that could easily be exploited if future development or configuration changes introduce external data sources into the schema selection logic. If a schema name were derived from tenant identifiers, HTTP request parameters, or any other form of user-controllable input without proper sanitization, an attacker could inject malicious SQL payloads. This would allow for unauthorized access to sensitive database contents, modification of stored data, or potentially complete compromise of the underlying PostgreSQL instance depending on the privileges granted to the application's database account. The risk is exacerbated by the fact that schema-level operations often involve high-privilege actions such as creating tables or altering structures, which could lead to broader system impact beyond simple data exfiltration.
From a classification perspective, this vulnerability aligns with CWE-89 Improper Neutralization of Special Elements used in an SQL Command and falls under the ATT&CK technique T1190 Exploit Public-Facing Application, specifically within the context of database interaction manipulation. The lack of input validation for structural identifiers is a common oversight that undermines the integrity of data-driven applications. Even though the current implementation restricts schema names to operator-controlled values, relying on operational discipline rather than technical enforcement leaves the system vulnerable to misconfiguration or future code changes that might inadvertently expose this vector to external inputs.
To mitigate this risk, developers have addressed the issue in version 0.9.0a2 by implementing robust identifier quoting and validation routines. This fix ensures that any schema name provided is treated strictly as a literal string component of the query structure rather than executable code, thereby neutralizing injection attempts at the syntax level. For organizations still operating on affected versions prior to this update, immediate remediation involves restricting configuration inputs so that only trusted deployment configurations can define schema names. This workaround effectively limits the attack surface by ensuring that no external or user-supplied data influences the structural components of database queries until a permanent patch is applied and tested in production environments.