High, CVSS 7.5NuGetAmendedPublished
Microsoft.OpenApi.YamlReader vulnerable to denial of service via YAML alias expansion
CVE-2026-72923 · GHSA-7pxr-59rr-hqj2
- Affected
- NuGet microsoft.openapi.readers < 1.6.30
- Fixed in
- 1.6.30· Vendor fix available
- Issue
- Impact A small YAML OpenAPI document containing nested anchors and aliases can cause uncontrolled resource consumption in Microsoft.OpenApi.YamlReader and Microsoft.OpenApi.Readers. The issue affects OpenAPI document parsing through the public YAML reader APIs and can cause the parsing process to allocate excessive memory and terminate through out-of-memory conditions. Affected versions Microsoft.OpenApi.YamlReader = 2.0.0-preview.11, < 2.12.0 = 3.0.0, < 3.10.0 Microsoft.OpenApi.Readers < 1.6.30 Patches For the 1.X major version, versions 1.6.30 and above are patched. For the 2.X major version, versions 2.12.0 and above are patched. For the 3.X major version, versions 3.10.0 and above are patched. Impact Applications, CLIs, developer tools, or services that parse untrusted YAML OpenAPI documents in-process may be terminated by a crafted YAML document containing nested anchors and aliases. The impact is availability/process termination only. This report does not claim remote code…
Recommended action: Upgrade to 1.6.30 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.