CVE-2026-50589Network attack vector

Unauthenticated service crash via recursive JSON parsing

Published Jun 4, 2026 · Updated Jun 5, 2026

Denial of service in OpenStack Ironic 32 before 37.0.0 allows remote attackers to crash API services with recursive JSON. The API and optional JSON-RPC service parse deeply nested request bodies before initial payload validation, causing Python memory allocation to exceed Ironic's reduced thread-stack limit. No authentication is required; affected services remain unavailable until restarted, while the JSON-RPC path requires that optional endpoint to be enabled.

CVSS severity7.5
High
EPSS probability0.43%
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 32 before 37.0.0 allows remote attackers to crash API services with recursive JSON. The API and optional JSON-RPC service parse deeply nested request bodies before initial payload validation, causing Python memory allocation to exceed Ironic's reduced thread-stack limit. No authentication is required; affected services remain unavailable until restarted, while the JSON-RPC path requires that optional endpoint to be enabled.

The record

CVE
CVE-2026-50589
Published
Jun 4, 2026
Updated
Jun 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, CWE-502, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-502Deserialization of Untrusted Data
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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