CVE-2026-85695

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Source

https://cve.org/CVERecord?id=CVE-2026-85695

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85695.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-85695

Published

2026-09-04T14:32:38.104Z

Modified

2026-09-05T03:48:00.623041248Z

Severity

9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator

Summary

FastChat Unauthenticated Worker Registration SSRF and Model Spoofing

Details

FastChat contains an authentication bypass vulnerability in the /register_worker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victim model names to intercept user prompts, images, and responses, or probe internal network ports across the worker mesh.

Database specific

{
    "cwe_ids": [
        "CWE-306"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85695.json",
    "cna_assigner": "VulnCheck"
}

References

Affected packages

Git / github.com/lm-sys/fastchat

Affected ranges

Type

GIT

Repo

https://github.com/lm-sys/fastchat

Events

Introduced

Last affected

b21d0f780ca4472a13714262a0790f2ee1ade659

Database specific

Show details

{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "0.2.36"
        }
    ]
}

Affected versions

v0.*

v0.1.10

v0.2.1

v0.2.14

v0.2.18

v0.2.21

v0.2.22

v0.2.23

v0.2.25

v0.2.26

v0.2.27

v0.2.28

v0.2.29

v0.2.3

v0.2.30

v0.2.31

v0.2.32

v0.2.33

v0.2.34

v0.2.35

v0.2.36

v0.2.5

v0.2.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85695.json"