CVE-2026-44919: OpenStack Ironic Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-4g73-w726-53h3
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CVSS 4.3
CWE-696
Published
Advisory Summary

CVE-2026-44919 is a MODERATE (CVSS 4.3) denial of service vulnerability (CWE-696: Incorrect Behavior Order) affecting OpenStack Ironic libraries in the PyPI ecosystem. The issue involves pre-validation checksum calculation allows denial of service (dos) via infinite block devices. Remediation is available in the latest vendor maintenance releases.

CVE-2026-44919 at a Glance

CVE Identifier CVE-2026-44919
GHSA Identifier GHSA-4g73-w726-53h3
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-696: Incorrect Behavior Order
Affected Product OpenStack Ironic
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 4.3

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2026-44919

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

ironic fixed: Latest secure release 
pip install ironic>=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 ironic

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-44919, inspect your installed packages using pip:

pip show ironic

Analyze the terminal output to locate any version of OpenStack Ironic 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 ironic command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-696: Incorrect Behavior Order, where the product performs multiple related behaviors, but the behaviors are performed in the wrong order in ways that may produce resultant weaknesses. In OpenStack Ironic, 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

In OpenStack Ironic through 35.x before a3f6d73, during image handling, an infinite loop in checksum calculations can occur via the file:///dev/zero URL.

CVE-2026-44919 Affected OpenStack Ironic Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
ironic
pypi/ironic
PyPI
≤ 36.0.0

References

NVD — CVE-2026-44919 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44919
bugs.launchpad.net/ironic/+bug/2150332 WEB
https://bugs.launchpad.net/ironic/+bug/2150332
opendev.org/openstack/ironic PACKAGE
https://opendev.org/openstack/ironic
opendev.org/openstack/ironic/co... WEB
https://opendev.org/openstack/ironic/commit/a3f6d735ac3642ab95b49142c7305f072ae748d0
OpenStack Ironic Security Information SECURITY
https://security.openstack.org/ossa/OSSA-2026-013.html

Frequently Asked Questions

What is CVE-2026-44919?
CVE-2026-44919 is a security vulnerability in OpenStack Ironic involving Pre-Validation Checksum Calculation allows Denial of Service (DoS) via Infinite Block Devices under CWE-696: Incorrect Behavior Order.
Which OpenStack Ironic versions are affected?
Affected versions include releases prior to current release patches across affected packages: ironic.
What version fixes CVE-2026-44919?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is ironic affected?
Yes, ironic 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-2026-44919?
CVE-2026-44919 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2026-44919?
CVE-2026-44919 is classified under CWE-696: Incorrect Behavior Order (The product performs multiple related behaviors, but the behaviors are performed in the wrong order in ways that may produce resultant weaknesses.).
How can I check PyPI dependencies for CVE-2026-44919?
Run the dependency tree command: 'pip show ironic'. 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-4g73-w726-53h3",
  "modified" : "2026-06-08T20:07:39Z",
  "published" : "2026-05-14T03:32:08Z",
  "aliases" : [ "CVE-2026-44919" ],
  "summary" : "OpenStack Ironic: Pre-Validation Checksum Calculation allows Denial of Service (DoS) via Infinite Block Devices",
  "details" : "In OpenStack Ironic through 35.x before a3f6d73, during image handling, an infinite loop in checksum calculations can occur via the file:///dev/zero URL.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "ironic"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "36.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-44919"
  }, {
    "type" : "WEB",
    "url" : "https://bugs.launchpad.net/ironic/+bug/2150332"
  }, {
    "type" : "PACKAGE",
    "url" : "https://opendev.org/openstack/ironic"
  }, {
    "type" : "WEB",
    "url" : "https://opendev.org/openstack/ironic/commit/a3f6d735ac3642ab95b49142c7305f072ae748d0"
  }, {
    "type" : "WEB",
    "url" : "https://security.openstack.org/ossa/OSSA-2026-013.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-696" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-19T20:15:08Z",
    "nvd_published_at" : "2026-05-14T02:17:21Z"
  }
}