Vulnerability · Published Oct 15, 2026 · Assigned by GitHub_M
CVE-2026-100352kin-openapi: YAML NaN/Inf Values Bypass Built-in Guards and Panic via OAS 3.1 Validation Path
High 7.5
In plain English
A high-severity security flaw in kin-openapi from getkin. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
kin-openapi is a Go project for handling OpenAPI files. Prior to 0.148.0, the OpenAPI 3.1 validation path passes YAML NaN and infinity numeric values to santhosh-tekuri/jsonschema v6.0.2 without applying kin-openapi's existing finite-number guards. A remote unauthenticated client can send an application/yaml or application/x-yaml request body containing .nan, .inf, or -.inf to an operation with a numeric constraint, causing the dependency to create and dereference a nil big.Rat during ValidateRequest. Standard net/http servers recover the panic per connection, while other hosts or application goroutines may terminate the process. This issue is fixed in version 0.148.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-github-getkin-kin-openapi | no fix listed | DEBIAN-CVE-2026-100352 |
| Debian:13 | golang-github-getkin-kin-openapi | no fix listed | DEBIAN-CVE-2026-100352 |
| Debian:14 | golang-github-getkin-kin-openapi | no fix listed | DEBIAN-CVE-2026-100352 |
| Go | github.com/getkin/kin-openapi | 0.148.0 | GHSA-rj39-cv6w-8wv7 |
| Go | github.com/getkin/kin-openapi | 0.148.0 | GO-2026-6795 |
| Ubuntu:22.04:LTS | golang-github-getkin-kin-openapi | no fix listed | UBUNTU-CVE-2026-100352 |
| Ubuntu:24.04:LTS | golang-github-getkin-kin-openapi | no fix listed | UBUNTU-CVE-2026-100352 |
| Ubuntu:26.04:LTS | golang-github-getkin-kin-openapi | no fix listed | UBUNTU-CVE-2026-100352 |
| Ubuntu:26.10 | golang-github-getkin-kin-openapi | no fix listed | UBUNTU-CVE-2026-100352 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| getkin | kin-openapi | < 0.148.0 |
Weakness: CWE-754 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H