Vulnerability in Skyvern-Ai Skyvern
CVE-2026-82447
Skyvern before 1.0.45 contains a sandbox escape vulnerability in TextPromptBlock that renders prompts twice, first through a sandboxed Jinja environment and then through an unsandboxed environment. Attackers can inject malicious Jinja template syntax through workflow parameters or upstream block output to execute arbitrary code with server process privileges.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (54.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/Skyvern-AI/skyvern/commit/d723de621d5b3a340f3cc4d5b46bfe40a9a3124e (patch)
- github.com/Skyvern-AI/skyvern (product)
- github.com/Skyvern-AI/skyvern/blob/v1.0.44/skyvern/forge/sdk/workflow/models/bl… (technical-description)
- github.com/Skyvern-AI/skyvern/blob/v1.0.44/skyvern/forge/sdk/prompting.py (technical-description)
- www.vulncheck.com/advisories/skyvern-before-1.0.45-sandbox-escape-via-textpromp… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82447?
- CVE-2026-82447 is a high-severity vulnerability in Skyvern-Ai Skyvern, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 8.8/10. Published 2026-08-29.
- How severe is CVE-2026-82447?
- High severity. CVSS v3 base score is 8.8 out of 10.