CVE-2026-44919Public exploitNetwork attack vector

Authenticated denial of service via checksum loop

Published May 14, 2026 · Updated May 14, 2026

Denial of service in OpenStack Ironic allows remote authenticated users to exhaust conductor threads via crafted deployment requests. Image handling calculates a missing checksum for a file:// source before validating that the source is a regular file, so /dev/zero never reaches EOF and occupies a conductor thread. An authenticated user authorized to write node.instance_info and deploy a node can repeat the request until the thread pool is exhausted, interrupting provisioning until the service restarts.

CVSS severity6.5
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in OpenStack Ironic allows remote authenticated users to exhaust conductor threads via crafted deployment requests. Image handling calculates a missing checksum for a file:// source before validating that the source is a regular file, so /dev/zero never reaches EOF and occupies a conductor thread. An authenticated user authorized to write node.instance_info and deploy a node can repeat the request until the thread pool is exhausted, interrupting provisioning until the service restarts.

The record

CVE
CVE-2026-44919
Published
May 14, 2026
Updated
May 14, 2026
Vendor
OpenStack
Product
Ironic
Classifications
CWE-696, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <a3f6d735ac3642ab95b49142c7305f072ae748d0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenStack · Ironicversion=0 <a3f6d735ac3642ab95b49142c7305f072ae748d0

Published CVSS scores

4.3MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-696Incorrect Behavior Order
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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