Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M
CVE-2026-76905kin-openapi openai3filter: nil-pointer panic in ConvertErrors on malformed multipart/form-data body enables unauthenticated DoS
High 7.5
In plain English
A high-severity null pointer dereference 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. 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-github-getkin-kin-openapi | no fix listed | DEBIAN-CVE-2026-76905 |
| Debian:13 | golang-github-getkin-kin-openapi | no fix listed | DEBIAN-CVE-2026-76905 |
| Debian:14 | golang-github-getkin-kin-openapi | no fix listed | DEBIAN-CVE-2026-76905 |
| Go | github.com/getkin/kin-openapi | 0.141.0 | GHSA-mmfr-pmjx-hw9w |
| Go | github.com/getkin/kin-openapi | 0.141.0 | GO-2026-6274 |
| Ubuntu:22.04:LTS | golang-github-getkin-kin-openapi | no fix listed | UBUNTU-CVE-2026-76905 |
| Ubuntu:24.04:LTS | golang-github-getkin-kin-openapi | no fix listed | UBUNTU-CVE-2026-76905 |
| Ubuntu:26.04:LTS | golang-github-getkin-kin-openapi | no fix listed | UBUNTU-CVE-2026-76905 |
| Ubuntu:26.10 | golang-github-getkin-kin-openapi | no fix listed | UBUNTU-CVE-2026-76905 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| getkin | kin-openapi | >= 0.10.0, < 0.141.0 |
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H