PYSEC-2026-350

    Dashboard / Vulnerabilities / PYSEC-2026-350

    PYSEC-2026-350

    Published: 29 Jun 2026Last Modified: 1 Jul 2026

    Summary: External Control of File Name or Path in h2oai/h2o-3

    Details: Remote unauthenticated attackers can overwrite arbitrary server files with attacker-controllable data. The data that the attacker can control is not entirely arbitrary. h2o writes a CSV/XLS/etc file to disk, so the attacker data is wrapped in quotations and starts with "C1", if they're exporting as CSV.

    References: https://nvd.nist.gov/vuln/detail/CVE-2023-6569, https://github.com/h2oai/h2o-3/commit/e8884f5187eb81311877c5f0dd4d6d9c70f33d78, https://github.com/h2oai/h2o-3, https://huntr.com/bounties/a5d003dc-c23e-4c98-8dcf-35ba9252fa3c, https://pypi.org/project/h2o, https://github.com/advisories/GHSA-gqrq-j6pm-98c2

    Affected packages

    Package

    Name: h2o

    Purl: pkg:pypi/h2o

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.46.0.1

    Affected versions

    3.10.0.10
    3.10.0.3
    3.10.0.6
    3.10.0.7
    3.10.0.8
    3.10.3.3
    3.10.3.4
    3.10.4.1
    3.10.4.2
    3.10.4.3
    3.10.4.4
    3.10.4.6
    3.10.4.8

    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
    PYSEC-2026-350 | CVE-DB