PT-2026-29522 · Bytedance · Deer-Flow

Willem Jiang · CVE-2026-34430 · Published 2026-04-01 · Updated 2026-05-12

Positive Technologies (AI Summary)

CVSS v3.1

9.6

Critical

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions ByteDance Deer-Flow versions prior to commit 92c7a20

Description ByteDance Deer-Flow versions prior to commit 92c7a20 contain a sandbox escape vulnerability in bash tool handling. This 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 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.

Recommendations Update ByteDance Deer-Flow to commit 92c7a20 or later.

Exploit

Fix

Incomplete List of Disallowed Inputs

Weakness Enumeration

CWE-184

Related Identifiers

CVE-2026-34430

Affected Products

Deer-Flow

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34430.json · Exploit
• https://github.com/bytedance/deer-flow/commit/92c7a20cb74addc3038d2131da78f2e239ef542e · Patch
• https://github.com/bytedance/deer-flow/pull/1547 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34430 · Security Note
• https://osv.dev/vulnerability/CVE-2026-34430 · Vendor Advisory
• https://github.com/bytedance/deer-flow · Note
• https://t.me/cveNotify/163155 · Telegram Post
• https://vulncheck.com/advisories/bytedance-deerflow-localsandboxprovider-host-bash-escape · Note
• https://twitter.com/CVEnew/status/2039372055062221104 · Twitter Post
• https://twitter.com/CveFindCom/status/2039670031542354006 · Twitter Post
• https://twitter.com/TheHackerWire/status/2039379423179444308 · Twitter Post