CVE-2026-85695

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    CVE-2026-85695

    Published: 4 Sept 2026Last Modified: 12 Sept 2026

    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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85695.json, https://nvd.nist.gov/vuln/detail/CVE-2026-85695, https://www.vulncheck.com/advisories/fastchat-unauthenticated-worker-registration-ssrf-and-model-spoofing, https://github.com/lm-sys/FastChat/issues/3886, https://github.com/lm-sys/FastChat, https://github.com/lm-sys/FastChat/blob/v0.2.36/fastchat/serve/controller.py

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v0.2.36
    v0.2.35
    v0.2.34
    v0.2.33
    v0.2.32
    v0.2.31
    v0.2.30
    v0.2.29
    v0.2.28
    v0.2.27
    v0.2.26
    v0.2.25
    v0.2.23
    v0.2.22
    v0.2.21
    v0.2.18
    v0.2.14
    v0.2.9
    v0.2.5
    v0.2.3
    v0.2.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-85695 | CVE-DB