CVE-2026-123201

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    CVE-2026-123201

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: buku through 5.1.1 SSRF via bukuserver fetch_data and network_handle API

    Details: Buku (bukuserver) through 5.1.1 contains an unauthenticated server-side request forgery vulnerability that allows remote attackers to make the server request internal hosts by supplying a url parameter to /api/fetch_data or /api/network_handle. Attackers can target loopback, private, or cloud metadata IP addresses, which pass the weak is_bad_url() check and follow redirects, to discover internal services and read their page titles, descriptions, and keywords.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123201.json, https://nvd.nist.gov/vuln/detail/CVE-2026-123201, https://www.vulncheck.com/advisories/buku-through-5.1.1-ssrf-via-bukuserver-fetch-data-and-network-handle-api, https://github.com/jarun/buku/issues/910, https://github.com/jarun/buku/commit/13f6497afc974f02f1069b760772abe8815d1675, https://github.com/jarun/buku/pull/916, https://github.com/jarun/buku, https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/buku.py#L4057-L4084, https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/bukuserver/api.py#L97-L105

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -13f6497afc974f02f1069b760772abe8815d1675

    Affected versions

    v5.1.1
    v5.1

    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-2026-123201 | CVE-DB