EUVD-2026-23778
GHSA-5h65-jx66-j7p5
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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 NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
7DescriptionCVE.org
A security vulnerability has been detected in lm-sys fastchat up to 0.2.36. This issue affects the function api_generate of the component Worker API Endpoint. The manipulation leads to resource consumption. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The identifier of the patch is c9e84b89c91d45191dc24466888de526fa04cf33. It is suggested to install a patch to address this issue. Commit ff66426 patched this issue in api_generate of base_model_worker.py and did miss other entry points.
AnalysisAI
Resource exhaustion in lm-sys FastChat up to 0.2.36 allows remote attackers to trigger denial of service by sending manipulated requests to the Worker API Endpoint's api_generate function. The vulnerability has publicly available exploit code and is confirmed patched upstream, though the fix in commit c9e84b89c91d45191dc24466888de526fa04cf33 addresses only the primary entry point in base_model_worker.py while missing other vulnerable code paths. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Remote attackers can exploit this vulnerability without authentication or user interaction against any FastChat deployment exposing the Worker API Endpoint on a network-accessible interface. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Multiple signals present conflicting risk profiles. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a series of specially crafted requests to the Worker API Endpoint's api_generate function, each designed to consume excessive memory or CPU resources. Because the endpoint requires no authentication (PR:N) and allows remote network access (AV:N), the attacker can launch this attack from any network location. … |
| Remediation | Apply the upstream patch from commit c9e84b89c91d45191dc24466888de526fa04cf33 (referenced in GitHub PR #3835 at https://github.com/lm-sys/FastChat/pull/3835) to address the vulnerability in the api_generate function of base_model_worker.py. … Detailed patch versions, workarounds, and compensating controls in full report. |
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