CVE-2026-34430: Deerflow

Critical severity, CVSS 9.6. EPSS: 0.8% chance of exploitation in the next 30 days.

ByteDance DeerFlow versions prior to commit 92c7a20 contain a sandbox escape vulnerability in bash tool handling that allows attackers to execute arbitrary commands on the host system by bypassing regex-based validation using shell features such as directory changes and relative paths. Attackers can exploit the incomplete shell semantics modeling to read and modify files outside the sandbox boundary and achieve arbitrary command execution through subprocess invocation with shell interpretation enabled.

Affected products

• Deerflow Deerflow: before 2026-03-29 (fixed in 2026-03-29)

Published 2026-04-01. Last modified 2026-07-14.