QWED-AI QWED up to 5.1.1 Expression Parser src/qwed_new/api/main.py parse_expr expression code injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in QWED-AI QWED up to 5.1.1. The affected element is the function parse_expr of the file src/qwed_new/api/main.py of the component Expression Parser. This manipulation of the argument expression causes code injection. This vulnerability is tracked as CVE-2026-55585. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in QWED-AI QWED up to 5.1.1. Affected by this vulnerability is the function parse_expr of the file src/qwed_new/api/main.py of the component Expression Parser. The manipulation of the argument expression with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

QWED is open-source AI verification infrastructure for deterministic verification of LLM outputs, tool calls, code, schemas, and agent state before production execution. Prior to 5.1.2, the qwed package passes caller-controlled math expressions directly to SymPy parse_expr() without restricted global_dict and local_dict namespaces, allowing Python eval() to resolve builtins and execute arbitrary Python code in the API server process. In src/qwed_new/api/main.py, POST /verify/math is protected by get_current_tenant but accepts any valid tenant API key, reads the expression field, applies only a cosmetic re.sub(r'(\d)(()', r'\1*\2', expression) normalization, and passes the result to parse_expr(). In src/qwed_new/core/batch.py, POST /verify/batch sends math items through batch_service.create_job(), stores item.query verbatim, and _verify_item() passes VerificationType.MATH input to parse_expr() without sanitization. The default-enabled POST /auth/signup endpoint allows anyone to create a standard tenant account, POST /auth/api-keys issues an x-api-key, and either vulnerable path can then be used to read or write files, modify data, execute operating system commands, terminate the service, and compromise other tenants in a shared deployment. This issue is fixed in version 5.1.2.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-55585 since 06/17/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059 for this issue.

Upgrading to version 5.1.2 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• QWED-AI

Name

• QWED

Version

• 5.1.0
• 5.1.1

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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