CVE-2026-72923 Microsoft OpenApi - Denial of Service

Microsoft.OpenApi.YamlReader 2.0.0-preview.11 to 2.12.0, 3.0.0 to 3.10.0, and Microsoft.OpenApi.Readers prior to 1.6.30 contain a denial of service caused by uncontrolled resource consumption during YAML-to-JSON conversion of nested anchors and aliases, letting attackers cause out-of-memory conditions, exploit requires crafted YAML document.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
1.20% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-400

Vendor fix

Update to Microsoft.OpenApi.YamlReader 2.12.0, 3.10.0 or Microsoft.OpenApi.Readers 1.6.30 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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