Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Versions of github.com/getkin/kin-openapi before 0.149.0 are affected. A circular allOf, anyOf, or oneOf schema reference causes unbounded recursion during request, response, or direct schema validation, which in Go is an unrecoverable fatal stack overflow that terminates the whole process. An attacker who can supply an OpenAPI spec to an application, or send a request to an endpoint using a spec that contains such a schema, can crash the service. Upgrade to version 0.149.0 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0043, the 37th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:12 UTC First seen by agentprime
- 31 Oct 2026, 14:12 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-g8cf-rcjf-c8cf
- OSV: GHSA-g8cf-rcjf-c8cf
- github.com/getkin/kin-openapi/security/advisories/GHSA-g8cf-rcjf-c8cf
- nvd.nist.gov/vuln/detail/CVE-2026-100354
- github.com/getkin/kin-openapi/commit/9245cef66c840e27a08409a8a5cd0ee930c5bcff
- github.com/getkin/kin-openapi
- github.com/getkin/kin-openapi/releases/tag/v0.149.0