Vulnerability in Bytedance Inc. Deerflow
CVE-2026-34430
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.008 · change: +0.004
Affected products
- Bytedance Inc. Deerflow — versions 0
- Deerflow
Weakness classification (CWE)
References
- github.com/bytedance/deer-flow/pull/1547 (issue-tracking, Patch, Issue Tracking, Vendor Advisory)
- github.com/bytedance/deer-flow/commit/92c7a20cb74addc3038d2131da78f2e239ef542e (Patch, patch)
- www.vulncheck.com/advisories/bytedance-deerflow-localsandboxprovider-host-bash-… (VDB Entry, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-34430?
- CVE-2026-34430 is a high-severity vulnerability in Bytedance Inc. Deerflow, classified under Incomplete List of Disallowed Inputs. CVSS score: 8.8/10. Published 2026-04-01.
- How severe is CVE-2026-34430?
- High severity. CVSS v3 base score is 8.8 out of 10.