---
title: "CVE-2026-73501\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-73501?format=md
keywords: index, follow
---

# CVE-2026-73501

Publication date 12 August 2026

Last updated 19 August 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**9.1 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2026-73501?format=md#impact-score)

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## Description

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.144.0,
ValidationHandler.Load() in openapi3filter/validation\_handler.go silently
replaces a nil AuthenticationFunc with NoopAuthenticationFunc, which
returns nil without checking credentials. This substitution causes every
OpenAPI security requirement to be satisfied for unauthenticated requests
when an application relies on ValidationHandler as its enforcement
middleware. The no-op callback prevents the fail-closed
ErrAuthenticationServiceMissing path from being reached and forwards the
request to protected handlers that may require an API key, OAuth token, or
another security scheme. This issue is fixed in version 0.144.0.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| golang-github-getkin-kin-openapi | 26.04 LTS resolute | Needs evaluation |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.1 · Critical

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.1 · Critical |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-73501)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-73501)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-73501)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-73501)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-73501>
* <https://github.com/getkin/kin-openapi/security/advisories/GHSA-r277-6w6q-xmqw>
* <https://github.com/getkin/kin-openapi/commit/f0407d53b0730280266f454b755010e7eeb985da>
* <https://github.com/getkin/kin-openapi/releases/tag/v0.144.0>