CVE-2026-100352 kin-openapi: YAML NaN/Inf Values Bypass Built-in Guards and Panic via OAS 3.1 Validation Path
Remote attackers can cause a denial of service by sending YAML NaN or infinity values that bypass validation guards and trigger a panic in the kin-openapi library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-100352?
CVE-2026-100352 is a high-severity denial of service vulnerability in getkin kin-openapi, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-754
Which versions are affected by CVE-2026-100352?
2 open source packages ship an affected version, including github.com/getkin/kin-openapi.
| Package | Affected | Fixed in |
|---|---|---|
github.com/getkin/kin-openapi Go | All versions | 0.148.0 |
github.com/getkin/kin-openapi Go | All versions | 0.148.0 |
How do I fix CVE-2026-100352?
Upgrade github.com/getkin/kin-openapi to 0.148.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-100352 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100352 exists.
Sources
Also known as CLEANSTART-2026-MH48139, DEBIAN-CVE-2026-100352, ECHO-46ca-0724-4961, GHSA-rj39-cv6w-8wv7, MINI-2w9m-2h26-9rq8, MINI-2wgq-c2mw-54v8 and 25 more.