CVE-2026-55585 QWED: Authenticated Remote Code Execution via Unsafe SymPy `parse_expr()`
Authenticated attackers can execute arbitrary Python code via unsafe SymPy expression parsing in QWED, leading to full system compromise.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55585?
CVE-2026-55585 is a high-severity code injection vulnerability in QWED-AI qwed-verification, published on 25 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-94
Which versions are affected by CVE-2026-55585?
3 open source packages ship an affected version, including qwed.
| Package | Affected | Fixed in |
|---|---|---|
qwed PyPI | All versions | 5.1.2 |
qwed PyPI | All versions | 5.1.2 |
qwed PyPI | All versions | 5.1.2 |
How do I fix CVE-2026-55585?
Upgrade qwed to 5.1.2 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-55585 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55585 exists.
Sources
Also known as GHSA-q27q-98j4-9pfv, PYSEC-2026-3914.