CVE-2026-34172 Giskard Agents have Server-side template injection via ChatWorkflow.chat() using non-sandboxed Jinja2 Environment
Attackers can achieve remote code execution by passing malicious input to ChatWorkflow.chat() due to unsafe Jinja2 template rendering.
- 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-2026-34172?
CVE-2026-34172 is a high-severity code injection vulnerability in Giskard-AI giskard-oss, published on 31 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Giskard is an open-source Python library for testing and evaluating agentic systems. Prior to versions 0.3.4 and 1.0.2b1, ChatWorkflow.chat(message) passes its string argument directly as a Jinja2 template source to a non-sandboxed Environment. A developer who passes user input to this method enables full remote code execution via Jinja2 class traversal. The method name chat and parameter name message naturally invite passing user input directly, but the string is silently parsed as a Jinja2 template, not treated as plain text. This issue has been patched in versions 0.3.4 and 1.0.2b1.
Weakness: CWE-1336
Which versions are affected by CVE-2026-34172?
5 open source packages ship an affected version, including giskard-agents. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
giskard-agents PyPI | All versions | 0.3.4, 1.0.2b1 |
giskard-agents PyPI | All versions | 0.3.4 |
giskard-agents PyPI | All versions | 0.3.4 |
giskard-agents PyPI | From 1.0.1a1 | 1.0.2b1 |
giskard-agents PyPI | From 1.0.1a1 | 1.0.2b1 |
Products include Giskard Giskard-Agent, Giskard Giskard-Agents.
How do I fix CVE-2026-34172?
Upgrade giskard-agents to a fixed version for your release line: 0.3.4 or 1.0.2b1.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-34172 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34172 exists.
Sources
Also known as GHSA-frv4-x25r-588m, PYSEC-2026-2487.