HighCVE-2026-97394

Getkin Kin-openapi: Uncaught Exception (CVE-2026-97394)

Published 15.10.2026Last modified 20.10.2026Sources: OSV, CVE.org, Hersteller, Red Hat

Public exploit

What is affected, what to do

A flaw was found in kin-openapi's openapi3filter module. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by crashing the application.

An exploit is publicly available. Update github.com/getkin/kin-openapi to version 0.143.0.

Affected: Getkin Kin-openapi gte 0.136.0, < 0.143.0..*

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Metrics

7.5

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: Vendor (CNA), CVSS v3

7.5

CVSS v3

Severity High on the scale from 0 to 10.

Source: OSV, CVE.org, Hersteller, Red Hat

0.6 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 49.5

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 87.08 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: PoC (publicly reported)
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 7.5 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.5
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.6 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 49.5; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 15.10.2026
CISA assessment (SSVC): Exploitation: proof of concept · automatable · Technical impact: partial; Source: CISA Vulnrichment, as of 20 October 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-248, CWE-476

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A flaw was found in kin-openapi's openapi3filter module. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by crashing the application. The issue occurs when processing OpenAPI 3.1 array schemas that lack an items definition, causing the parser to encounter an unhandled null pointer while decoding form-encoded or multipart request bodies and response headers. An attacker can exploit this condition by submitting a crafted request to an affected endpoint, resulting in unexpected service termination.

Source: OSV (Open Source Vulnerabilities), cvelistv5, NVD (NIST), GitHub Security Advisories, redhat_csaf

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
getkin	kin-openapi	`≥ 0.136.0, < 0.143.0`	—
go	github.com/getkin/kin-openapi	`0.136.0`	`0.143.0`

Vendors and products

Weakness classes (CWE)

CWE-248Uncaught Exception
Base
An exception is thrown from a function, but it is not caught.
Entry at MITRE CWE-248
CWE-476NULL Pointer Dereference
Base
The product dereferences a pointer that it expects to be valid but is NULL.
Entry at MITRE CWE-476

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

Reference tagged as exploit	github.com (opens in a new tab)	PoC (publicly reported)reported, not verified	—

References & sources

github.comgetkin/kin-openapi/security/advisories/GHSA-p6wj-qrr4-pgh5web, x_refsource_CONFIRM
NVD (NIST)vuln/detail/CVE-2026-97394advisory
github.comgetkin/kin-openapi/commit/30e292371a89ca6d1f91a9553e0aa518b49f8…web, x_refsource_MISC
github.comgetkin/kin-openapipackage
github.comgetkin/kin-openapi/releases/tag/v0.143.0web, x_refsource_MISC
github.comopnsense/core/security/advisories/GHSA-26cj-h9rj-g5pfExploit

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

20.10.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: proof of concept, automatable: yes

New references:

https://github.com/opnsense/core/security/advisories/GHSA-26cj-h9rj-g5pf

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://github.com/opnsense/core/security/advisories/GHSA-26cj-h9rj-g5pf
SSVC assessment	added	—	{"id":"CVE-2026-97394","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-20T02:44:45.924107Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

15.10.2026ReceivedGitHub

CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness type: CWE-476, CWE-248

Description added or changed

New references:

Show 8 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Description	added	—	kin-openapi is a Go project for handling OpenAPI files. From 0.136.0 until 0.143.0, openapi3filter accepts OpenAPI 3.1 array schemas without an items keyword and then dereferences the nil Schema.Items value while decoding application/x-www-form-urlencoded or multipart/form-data request bodies, response headers, and other array parameter surfaces. A remote unauthenticated client can reach an affected operation with a nonempty request or matching response and deterministically trigger a nil-pointer panic during ValidateRequest or ValidateResponse. OpenAPI 3.0 documents are not affected because document validation rejects arrays without items, and JSON request bodies use a different decoder path. This issue is fixed in version 0.143.0.
CVSS	added	—	AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)	added	—	CWE-476
Weakness type (CWE)	added	—	CWE-248
Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/97xxx/CVE-2026-97394.json">CVE-2026-97394</a>
Reference	added	—	https://github.com/getkin/kin-openapi/commit/30e292371a89ca6d1f91a9553e0aa518b49f838d
Reference	added	—	https://github.com/getkin/kin-openapi/releases/tag/v0.143.0
Reference	added	—	https://github.com/getkin/kin-openapi/security/advisories/GHSA-p6wj-qrr4-pgh5

Source identifier: security-advisories@github.com

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