CVE-2026-55748: Horizon OpenStack Horizon RC File Generation Vulnerability

MODERATE
Advisory Identifier: GHSA-6wrm-x65g-hr4p
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CVSS 6.0
CWE-78
Published
Advisory Summary

CVE-2026-55748 is a MODERATE (CVSS 6.0) openstack horizon rc file generation vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Horizon libraries in the PyPI ecosystem. The issue involves openstack horizon rc file generation does not escape special characters in project names. Remediation is available in the latest vendor maintenance releases.

CVE-2026-55748 at a Glance

CVE Identifier CVE-2026-55748
GHSA Identifier GHSA-6wrm-x65g-hr4p
Severity MODERATE
CVSS v3.1 Base Score 6.0
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Horizon
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required High (PR:H)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability Low (A:L)

How to Fix CVE-2026-55748

To remediate this vulnerability, upgrade all affected Horizon dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

horizon fixed: Latest secure release 
pip install horizon>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show horizon

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-55748, inspect your installed packages using pip:

pip show horizon

Analyze the terminal output to locate any version of Horizon in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show horizon command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Horizon, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

OpenStack Horizon before 25.7.4 produces scripts for OpenStack RC file downloading that may have a crafted project name with shell metacharacters. NOTE: some parties consider this a security hardening opportunity to address certain types of user error, not a vulnerability.

CVE-2026-55748 Affected Horizon Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
horizon
pypi/horizon
PyPI
≤ 25.7.3

References

NVD — CVE-2026-55748 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55748
Horizon Source Repository REPOSITORY
https://github.com/openstack/horizon
launchpad.net/bugs/2152240 WEB
https://launchpad.net/bugs/2152240
wiki.openstack.org/wiki/ossn/ossn-0097 WEB
https://wiki.openstack.org/wiki/OSSN/OSSN-0097

Frequently Asked Questions

What is CVE-2026-55748?
CVE-2026-55748 is a security vulnerability in Horizon involving OpenStack Horizon RC file generation does not escape special characters in project names under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Horizon versions are affected?
Affected versions include releases prior to current release patches across affected packages: horizon.
What version fixes CVE-2026-55748?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is horizon affected?
Yes, horizon is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-55748?
CVE-2026-55748 has a CVSS v3.1 base score of 6.0 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L.
What CWE is associated with CVE-2026-55748?
CVE-2026-55748 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check PyPI dependencies for CVE-2026-55748?
Run the dependency tree command: 'pip show horizon'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6wrm-x65g-hr4p",
  "modified" : "2026-06-18T14:37:28Z",
  "published" : "2026-06-17T18:35:56Z",
  "aliases" : [ "CVE-2026-55748" ],
  "summary" : "OpenStack Horizon RC file generation does not escape special characters in project names",
  "details" : "OpenStack Horizon before 25.7.4 produces scripts for OpenStack RC file downloading that may have a crafted project name with shell metacharacters. NOTE: some parties consider this a security hardening opportunity to address certain types of user error, not a vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "horizon"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "25.7.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55748"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openstack/horizon"
  }, {
    "type" : "WEB",
    "url" : "https://launchpad.net/bugs/2152240"
  }, {
    "type" : "WEB",
    "url" : "https://wiki.openstack.org/wiki/OSSN/OSSN-0097"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-18T14:37:28Z",
    "nvd_published_at" : "2026-06-17T15:17:02Z"
  }
}