CVE Explorer
CVE-2026-49451
The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a 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
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"OpenAPI.NET","vendor":"microsoft","versions":[{"status":"affected","version":">= 2.0.0-preview11, < 2.7.5"},{"status":"affected","version":">= 3.0.0, < 3.5.4"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:9d556513811bf0cd7a246d25ab803a683fd842e7eaec963bfa4be1d11809da25 · sha256:72ff5a4df9d67688… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:9d556513811bf0cd7a246d25ab803a683fd842e7eaec963bfa4be1d11809da25 · sha256:72ff5a4df9d67688… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-674","description":"CWE-674: Uncontrolled Recursion","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:9d556513811bf0cd7a246d25ab803a683fd842e7eaec963bfa4be1d11809da25 · sha256:72ff5a4df9d67688… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"tags":["exploit"],"url":"https://github.com/microsoft/OpenAPI.NET/security/advisories/GHSA-v5pm-xwqc-g5wc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9d556513811bf0cd7a246d25ab803a683fd842e7eaec963bfa4be1d11809da25 · sha256:72ff5a4df9d67688… · /containers/adp/0/references/0
{"name":"https://github.com/microsoft/OpenAPI.NET/security/advisories/GHSA-v5pm-xwqc-g5wc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/microsoft/OpenAPI.NET/security/advisories/GHSA-v5pm-xwqc-g5wc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9d556513811bf0cd7a246d25ab803a683fd842e7eaec963bfa4be1d11809da25 · sha256:72ff5a4df9d67688… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.