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CVE-2026-100347

5.3 · MEDIUM

kin-openapi is a Go project for handling OpenAPI files.

Published Oct 15, 2026CWE-20EPSS 0.52%

Overview

CVE-2026-100347 is a medium-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3filter.ValidationHandler uses the routers/legacy router, which passes an unsupported or non-canonical HTTP method for an existing static path to openapi3.PathItem.GetOperation. The default branch of GetOperation panics before authentication runs, so an unauthenticated remote client can repeatedly send methods such as PROPFIND or lowercase get to abort connections and generate stack-trace log growth. The specific panic requires an exact static path; a concrete path matched only by a templated route does not reach the same sink. This issue is fixed in version 0.145.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/getkin/kin-openapi/commit/f1a5b523b82868d2d9be2e116b4e942892be72c3GitHubgithub.com/getkin/kin-openapi/releases/tag/v0.145.0GitHubgithub.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gjGitHubgithub.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-100347?

CVE-2026-100347 is a medium-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-100347?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-100347?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-100347?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-100347 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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