CVE-2026-34430 | Bytedance DeerFlow incomplete blacklist

VDB-354674 · CVE-2026-34430 · GCVE-0-2026-34430 BYTEDANCE DEERFLOW INCOMPLETE BLACKLIST HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 1.09+ Summaryinfo A vulnerability described as critical has been identified in Bytedance DeerFlow. Affected by this issue is some unknown functionality. Such manipulation leads to incomplete blacklist. This vulnerability is traded as CVE-2026-34430. The attack may be launched remotely. There is no exploit available. A patch should be applied to remediate this issue. Detailsinfo A vulnerability, which was classified as critical, has been found in Bytedance DeerFlow (unknown version). Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a incomplete blacklist vulnerability. Using CWE to declare the problem leads to CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. Impacted is confidentiality, integrity, and availability. CVE summarizes: ByteDance Deer-Flow 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. The weakness was shared by Chia Min Jun Lennon. The advisory is available at github.com. This vulnerability is handled as CVE-2026-34430 since 03/27/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1562.006 by the MITRE ATT&CK project. Applying the patch 92c7a20cb74addc3038d2131da78f2e239ef542e is able to eliminate this problem. The bugfix is ready for download at github.com. Productinfo Vendor Bytedance Name DeerFlow License open-source CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Incomplete blacklist CWE: CWE-184 / CWE-183 / CWE-20 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: 92c7a20cb74addc3038d2131da78f2e239ef542e Timelineinfo 03/27/2026 CVE reserved 04/01/2026 +4 days Advisory disclosed 04/01/2026 +0 days VulDB entry created 04/01/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Researcher: Chia Min Jun Lennon Status: Confirmed CVE: CVE-2026-34430 (🔒) GCVE (CVE): GCVE-0-2026-34430 GCVE (VulDB): GCVE-100-354674 Entryinfo Created: 04/01/2026 17:00 Changes: 04/01/2026 17:00 (67) Complete: 🔍 Cache ID: 99:5FB:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸