What’s Vulnerable › Vulnerabilities

CVE-2026-34430: ByteDance DeerFlow LocalSandboxProvider Host Bash Escape

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-01 · updated 2026-10-26
• Weakness: CWE-184

Description

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: before 2026-03-29 — fixed in 2026-03-29

How to fix

Upgrade to a fixed version: Deerflow 2026-03-29. Check the vendor advisory for mitigations.

References

• https://github.com/bytedance/deer-flow/commit/92c7a20cb74addc3038d2131da78f2e239ef542e
• https://github.com/bytedance/deer-flow/pull/1547
• https://www.vulncheck.com/advisories/bytedance-deerflow-localsandboxprovider-host-bash-escape

Get alerted when CVE-2026-34430 or the next vulnerability affects your stack