CVE-2026-88002

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    CVE-2026-88002

    Published: 9 Sept 2026Last Modified: 12 Sept 2026

    Summary: Open WebUI: Any authenticated user can hang the server via a cyclic chat message history

    Details: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.1, the message-chain reconstruction helper in backend/open_webui/utils/misc.py advanced through a chat history by map key but tracked visited entries using each message body's optional id field. An authenticated user could store id-less messages in a parent cycle and trigger a non-terminating walk that blocked the async event loop, grew memory until termination, and remained persistent across process restarts. This issue is fixed in version 0.11.1.

    References: https://github.com/open-webui/open-webui/releases/tag/v0.11.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88002.json, https://github.com/open-webui/open-webui/security/advisories/GHSA-jqhh-cjmq-vmv6, https://nvd.nist.gov/vuln/detail/CVE-2026-88002, https://github.com/open-webui/open-webui/commit/5c79ccc9e5c9efc2bc024d8f0b9757652ece929a, https://github.com/open-webui/open-webui/pull/28034

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 22132e155aa7e8522f4c79a7aae4bcfc0d7f6b0d
    Fixed -5c79ccc9e5c9efc2bc024d8f0b9757652ece929a

    Affected versions

    v0.11.0

    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-2026-88002 | CVE-DB