Vulnerability · Published Apr 1, 2026 · Assigned by VulnCheck

CVE-2026-34430ByteDance DeerFlow LocalSandboxProvider Host Bash Escape

High 8.8

In plain English

A high-severity security flaw in DeerFlow from Bytedance Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.4%top 64.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Bytedance Inc.	DeerFlow	0 – before 92c7a20cb74addc3038d2131da78f2e239ef542e

Weakness: CWE-184 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://github.com/bytedance/deer-flow/pull/1547 issue-tracking
https://github.com/bytedance/deer-flow/commit/92c7a20cb74addc3038d2131da78f2e239ef542e patch
https://www.vulncheck.com/advisories/bytedance-deerflow-localsandboxprovider-host-bash-escape third-party-advisory