CVE-2026-27961 Agenta's Server-Side Template Injection (SSTI) via custom evaluator Jinja2 templates allows RCE
Attacker can achieve remote code execution via Server-Side Template Injection in Agenta's evaluator templates, affecting self-hosted deployments.
- 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-2026-27961?
CVE-2026-27961 is a high-severity code injection vulnerability in Agenta-AI agenta, published on 26 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Agenta is an open-source LLMOps platform. A Server-Side Template Injection (SSTI) vulnerability exists in versions prior to 0.86.8 in Agenta's API server evaluator template rendering. Although the vulnerable code lives in the SDK package, it is executed server-side within the API process when running evaluators. This does not affect standalone SDK usage — it only impacts self-hosted or managed Agenta platform deployments. Version 0.86.8 contains a fix for the issue.
Weakness: CWE-1336
Which versions are affected by CVE-2026-27961?
1 open source package ship an affected version, including agenta. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
agenta PyPI | All versions | 0.86.8 |
Products include Agentatech Agenta.
How do I fix CVE-2026-27961?
Upgrade agenta to 0.86.8 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-27961 being exploited?
There is no known exploitation of CVE-2026-27961 in the wild and no public exploit code.
Other vulnerabilities in Agenta-AI agenta
Sources
Also known as GHSA-cfr2-mp74-3763, PYSEC-2026-7.