FastGPT
CVE-2026-42343
MEDIUM
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionGitHub Advisory
FastGPT is an AI Agent building platform. In versions 4.14.13 and prior, the code-sandbox component suffers from insufficient resource isolation and uncontrolled resource consumption. The service relies solely on an application-level soft limit (a 500ms polling interval) for memory management and lacks strict OS-level constraints such as cgroups or kernel-level namespaces. This architectural weakness allows attackers to easily bypass memory checks via time-window attacks, or exhaust the entire JavaScript worker pool via concurrent CPU-intensive requests, resulting in a complete Denial of Service (DoS) for legitimate users. At time of publication, there are no publicly available patches.
AnalysisAI
Denial of service vulnerability in FastGPT 4.14.13 and prior affects the code-sandbox component due to insufficient resource isolation and reliance on weak application-level memory limits. Unauthenticated remote attackers can trigger complete service unavailability by launching time-window memory attacks or exhausting the JavaScript worker pool via concurrent CPU-intensive requests. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The FastGPT code-sandbox API endpoint must be network-accessible without authentication (default configuration). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 6.3 with attack vector Network and complexity Low indicates a remotely exploitable vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker sends a rapid burst of API requests to the code-sandbox endpoint, each containing a CPU-intensive JavaScript payload designed to execute longer than the 500ms polling interval. The soft memory limit is bypassed through timing attacks, and the JavaScript worker pool is exhausted as requests queue faster than workers complete execution. … |
| Remediation | No vendor-released patch is available at time of publication. … Detailed patch versions, workarounds, and compensating controls in full report. |
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