{"items":[{"id":"NVI-00017649","kind":"vulnerability","title":"Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-v5pm-xwqc-g5wc","CVE-2026-49451"],"plain_summary":"GitHub lists this reviewed advisory for Microsoft.OpenAPI, Microsoft.OpenApi. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-399193f2c635f5981ee3fb30e86c06bd"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-06T12:57:30.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-399193f2c635f5981ee3fb30e86c06bd"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-399193f2c635f5981ee3fb30e86c06bd","url":"https://github.com/advisories/GHSA-v5pm-xwqc-g5wc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-v5pm-xwqc-g5wc","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T03:47:11.081Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-399193f2c635f5981ee3fb30e86c06bd"],"technology":"Microsoft.OpenAPI","known_exclusions":[],"conditions_summary":"### Impact\n\nA small OpenAPI document containing a circular schema reference can cause process termination through stack overflow in Microsoft.OpenApi. The issue affects OpenAPI document parsing through public OpenAPI.NET reader APIs and has been confirmed across both JSON and YAML reader paths.\n\n## Affected versions\n\n- `>= 2.0.0-preview.11, = 3.0.0, <= 3.5.3`\n\n### Patches\n\n- For the 2.X major version, versions 2.7.5 and above are patched.\n- For the 3.X major version, versions 3.5.4 and above are patched.\n- For the 1.X major version, the issue does not apply since that version of the library *could not* resolve references that pointed to another reference.\n\n## Impact\n\nApplications, CLIs, developer tools, or services that parse untrusted OpenAPI documents in-process may be terminated by a crafted OpenAPI document containing circular schema references.\n\nThe impact is availability/process termination only. This report does not claim remote code execution, authentication bypass, credential exposure, privilege escalation, data exposure, or Microsoft hosted service impact.\n\n## Details\n\nA standalone isolated-process harness confirmed repeatable process termination through pub","public_affected_ranges":[">= 3.0.0, <= 3.5.3"]},{"certainty":"source_listed","source_ids":["sr-399193f2c635f5981ee3fb30e86c06bd"],"technology":"Microsoft.OpenApi","known_exclusions":[],"conditions_summary":"### Impact\n\nA small OpenAPI document containing a circular schema reference can cause process termination through stack overflow in Microsoft.OpenApi. The issue affects OpenAPI document parsing through public OpenAPI.NET reader APIs and has been confirmed across both JSON and YAML reader paths.\n\n## Affected versions\n\n- `>= 2.0.0-preview.11, = 3.0.0, <= 3.5.3`\n\n### Patches\n\n- For the 2.X major version, versions 2.7.5 and above are patched.\n- For the 3.X major version, versions 3.5.4 and above are patched.\n- For the 1.X major version, the issue does not apply since that version of the library *could not* resolve references that pointed to another reference.\n\n## Impact\n\nApplications, CLIs, developer tools, or services that parse untrusted OpenAPI documents in-process may be terminated by a crafted OpenAPI document containing circular schema references.\n\nThe impact is availability/process termination only. This report does not claim remote code execution, authentication bypass, credential exposure, privilege escalation, data exposure, or Microsoft hosted service impact.\n\n## Details\n\nA standalone isolated-process harness confirmed repeatable process termination through pub","public_affected_ranges":[">= 2.0.0-preview.11, <= 2.7.4"]}],"null_published_at":"2026-11-05T19:10:21.431Z","source_updated_at":"2026-07-06T12:57:30.000Z","source_disclosed_at":"2026-06-30T15:56:24.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-05T03:47:11.081Z"}],"next_cursor":null,"snapshot_revision":"42594"}