CVE-2026-76905 kin-openapi openai3filter: nil-pointer panic in ConvertErrors on malformed multipart/form-data body enables unauthenticated DoS
Unauthenticated attackers can cause a denial of service via a nil-pointer panic in kin-openapi when processing malformed multipart/form-data requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-76905?
CVE-2026-76905 is a high-severity vulnerability in getkin kin-openapi, published on 21 Aug 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. From 0.10.0 until 0.141.0, openapi3filter.convertParseError in openapi3filter/validation_error_encoder.go dereferences e.Parameter.In without checking whether e.Parameter is nil. A malformed non-string scalar field in a multipart/form-data request body produces a nested ParseError with a nil RequestError.Parameter, and applications that render the validation error through openapi3filter.ConvertErrors or ValidationErrorEncoder panic. An unauthenticated client can repeatedly send such requests to deny service when the application lacks a recovery boundary. JSON request bodies and applications that do not use these error-rendering helpers are not affected. This issue is fixed in version 0.141.0.
Weakness: CWE-476
Which versions are affected by CVE-2026-76905?
3 open source packages ship an affected version, including github.com/getkin/kin-openapi.
| Package | Affected | Fixed in |
|---|---|---|
github.com/getkin/kin-openapi Go | From 0.10.0 | 0.141.0 |
github.com/getkin/kin-openapi Go | From 0.10.0 | 0.141.0 |
github.com/getkin/kin-openapi Go | From 0.10.0 | 0.141.0 |
How do I fix CVE-2026-76905?
Upgrade github.com/getkin/kin-openapi to 0.141.0 or later.
Is CVE-2026-76905 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-76905 exists.
Sources
Also known as DEBIAN-CVE-2026-76905, GHSA-mmfr-pmjx-hw9w, GO-2026-6274, MINI-3344-88gm-6mcc, MINI-3446-q988-7h93, MINI-3c5f-xpmm-9wxq and 41 more.