PYSEC-2026-645

    Dashboard / Vulnerabilities / PYSEC-2026-645

    PYSEC-2026-645

    Published: 2 Jul 2026Last Modified: 6 Jul 2026

    Summary: instack-undercloud vulnerable to symlink attack on tmp files

    Details: A flaw was found in instack-undercloud 7.2.0 as packaged in Red Hat OpenStack Platform Pike, 6.1.0 as packaged in Red Hat OpenStack Platform Oacta, 5.3.0 as packaged in Red Hat OpenStack Newton, where pre-install and security policy scripts used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.

    References: https://nvd.nist.gov/vuln/detail/CVE-2017-7549, https://access.redhat.com/errata/RHSA-2017:2557, https://access.redhat.com/errata/RHSA-2017:2649, https://access.redhat.com/errata/RHSA-2017:2687, https://access.redhat.com/errata/RHSA-2017:2693, https://access.redhat.com/errata/RHSA-2017:2726, https://access.redhat.com/security/cve/CVE-2017-7549, https://bugzilla.redhat.com/show_bug.cgi?id=1477403, https://github.com/pypa/advisory-database/tree/main/vulns/instack/PYSEC-2017-152.yaml, https://opendev.org/openstack/instack-undercloud, https://web.archive.org/web/20170907040549/http://www.securityfocus.com/bid/100407, http://www.securityfocus.com/bid/100407, https://pypi.org/project/instack-undercloud, https://github.com/advisories/GHSA-53wm-97p6-582f

    Affected packages

    Package

    Name: instack-undercloud

    Purl: pkg:pypi/instack-undercloud

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.0.1.dev90

    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-2026-645 | CVE-DB