CVE-2026-6607

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Source
https://cve.org/CVERecord?id=CVE-2026-6607
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6607.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-6607
Aliases
Published
2026-04-20T05:00:23Z
Modified
2026-10-28T02:30:59Z
Severity
  • 5.5 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
lm-sys fastchat Worker API Endpoint api_generate resource consumption
Details

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.

Database specific 
{
    "cna_assigner": "VulDB",
    "cwe_ids": [
        "CWE-400",
        "CWE-404"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6607.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "0.2.0"
                        },
                        {
                            "last_affected": "0.2.0"
                        },
                        {
                            "introduced": "0.2.2"
                        },
                        {
                            "last_affected": "0.2.2"
                        },
                        {
                            "introduced": "0.2.4"
                        },
                        {
                            "last_affected": "0.2.4"
                        },
                        {
                            "introduced": "0.2.6"
                        },
                        {
                            "last_affected": "0.2.6"
                        },
                        {
                            "introduced": "0.2.7"
                        },
                        {
                            "last_affected": "0.2.7"
                        },
                        {
                            "introduced": "0.2.8"
                        },
                        {
                            "last_affected": "0.2.8"
                        },
                        {
                            "introduced": "0.2.10"
                        },
                        {
                            "last_affected": "0.2.10"
                        },
                        {
                            "introduced": "0.2.11"
                        },
                        {
                            "last_affected": "0.2.11"
                        },
                        {
                            "introduced": "0.2.12"
                        },
                        {
                            "last_affected": "0.2.12"
                        },
                        {
                            "introduced": "0.2.13"
                        },
                        {
                            "last_affected": "0.2.13"
                        },
                        {
                            "introduced": "0.2.15"
                        },
                        {
                            "last_affected": "0.2.15"
                        },
                        {
                            "introduced": "0.2.16"
                        },
                        {
                            "last_affected": "0.2.16"
                        },
                        {
                            "introduced": "0.2.17"
                        },
                        {
                            "last_affected": "0.2.17"
                        },
                        {
                            "introduced": "0.2.19"
                        },
                        {
                            "last_affected": "0.2.19"
                        },
                        {
                            "introduced": "0.2.20"
                        },
                        {
                            "last_affected": "0.2.20"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/lm-sys/fastchat

Affected ranges

Type
GIT
Repo
https://github.com/lm-sys/fastchat
Events
Introduced
074f0b18155a81158dacbcba7db68807d14cb471
Fixed
c9e84b89c91d45191dc24466888de526fa04cf33
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0.2.1"
                },
                {
                    "last_affected": "0.2.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.3"
                },
                {
                    "last_affected": "0.2.3"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.5"
                },
                {
                    "last_affected": "0.2.5"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.9"
                },
                {
                    "last_affected": "0.2.9"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.14"
                },
                {
                    "last_affected": "0.2.14"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.18"
                },
                {
                    "last_affected": "0.2.18"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.21"
                },
                {
                    "last_affected": "0.2.21"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.22"
                },
                {
                    "last_affected": "0.2.22"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.23"
                },
                {
                    "last_affected": "0.2.23"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.24"
                },
                {
                    "last_affected": "0.2.24"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.25"
                },
                {
                    "last_affected": "0.2.25"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.26"
                },
                {
                    "last_affected": "0.2.26"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.27"
                },
                {
                    "last_affected": "0.2.27"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.28"
                },
                {
                    "last_affected": "0.2.28"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.29"
                },
                {
                    "last_affected": "0.2.29"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.30"
                },
                {
                    "last_affected": "0.2.30"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.31"
                },
                {
                    "last_affected": "0.2.31"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.32"
                },
                {
                    "last_affected": "0.2.32"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.33"
                },
                {
                    "last_affected": "0.2.33"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.34"
                },
                {
                    "last_affected": "0.2.34"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.35"
                },
                {
                    "last_affected": "0.2.35"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "introduced": "0.2.36"
                },
                {
                    "last_affected": "0.2.36"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "fixed": "c9e84b89c91d45191dc24466888de526fa04cf33"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

0.*
0.2.1
0.2.14
0.2.18
0.2.21
0.2.22
0.2.23
0.2.24
0.2.25
0.2.26
0.2.27
0.2.28
0.2.29
0.2.3
0.2.30
0.2.31
0.2.32
0.2.33
0.2.34
0.2.35
0.2.36
0.2.5
0.2.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6607.json"