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Vulnerabilities

Vulnerability · CVE-2026-100353

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

Published Oct 15, 2026 · catalog updated Oct 15, 2026

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.3%
Remediation
Version ranges on file
Affected products
go github.com/getkin/kin-openapi · golang github.com

## Summary The fix for GHSA-p6wj-qrr4-pgh5 addressed a nil-pointer dereference that occurs when an OpenAPI 3.1 array schema omits the keyword (which is legal under JSON Schema 2020-12). That fix patched three decoder paths: the standalone function, the top-level array check in , and . Three additional crash paths were missed. All of them reach the unguarded method ( ) or the unguarded array branch in (line 1015): 1. **Query parameters** with and no . 2. **deepObject** query parameters containing an array property with no . 3. **URL-encoded request bodies** where the array lives inside an / / sub-schema. This path bypasses the guard added by the GHSA-p6wj-qrr4-pgh5 fix, because that guard only inspects top-level properties. Each path is triggerable by an unauthenticated client and produces a deterministic nil-pointer panic during request validation. ## Details ### Root Cause The three paths patched for GHSA-p6wj-qrr4-pgh5 each received a nil- guard: But (line 576), which handles query-parameter and urlencoded-body array decoding, has **no** such guard: immediately dereferences the schema it is handed: For the deepObject path, (line 1015) has the same gap. Its array branch recurses with (line 1028), which can be nil, and the recursive call dereferences it at line 1015: For the allOf body path, validates only top-level (line 1429-1449). But (line 1474) recursively walks / / sub-schemas and calls on their properties, which never pass through the top-level guard and reach . ## Proof of Concept ### Environment - kin-openapi v0.144.0 (cloned at tag , commit ) - Go 1.26.7 - Each PoC calls first to prove the spec is legal, then drives directly ### Path 1: Query parameter array without items Spec (query param is , no ), request : ### Path 2: deepObject nested array without items Spec (deepObject param with array property , no ), request : ### Path 3: URL-encoded body with array inside allOf (bypasses the existing fix) Spec (urlencoded body, sub-schema with array property , no

Technical analysis

Mechanism and impact are interpreted from ingested advisories — not independent exploit research.

  • CWE classification

    NULL Pointer Dereference

  • Prerequisites and impact

    Follow the original vendor advisory for access prerequisites and impact. This catalog does not invent exploit conditions.

How to fix CVE-2026-100353

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-100353 is a high public vulnerability record for this product. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether this product is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: github.com/getkin/kin-openapi (>= 0.136.0, < 0.149.0); github.com/getkin/kin-openapi (>=0.136.0 <0.149.0); github.com. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 7.5 (technical impact); EPSS 0.3% (30-day exploitation probability). It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-476. Sources contributing to this record: cve_org, epss, github, gitlab. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Related intelligence

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2026 · NIST NVD

    Detected

    kin-openapi is a Go project for handling OpenAPI files. From 0.136.0 until 0.149.0, three openapi3filter decoder paths that were missed by the fix for GHSA-p6wj-qrr4-pgh5 lack a nil-items guard for legal OpenAPI 3.1 array schemas. An unauthenticated remote client can trigger a deterministic nil-pointer panic through an array query parameter, a deepObject query parameter containing an array propert

  2. Oct 15, 2026 · NIST NVD

    Updated

    kin-openapi is a Go project for handling OpenAPI files. From 0.136.0 until 0.149.0, three openapi3filter decoder paths that were missed by the fix for GHSA-p6wj-qrr4-pgh5 lack a nil-items guard for legal OpenAPI 3.1 array schemas. An unauthenticated remote client can trigger a deterministic nil-pointer panic through an array query parameter, a deepObject query parameter containing an array propert

  3. Oct 15, 2026 · GitHub Advisory Database

    Updated

    ## Summary The fix for GHSA-p6wj-qrr4-pgh5 addressed a nil-pointer dereference that occurs when an OpenAPI 3.1 array schema omits the keyword (which is legal under JSON Schema 2020-12). That fix patched three decoder paths: the standalone function, the top-level array check in , and . Three additional crash paths were missed. All of them reach the unguarded method ( ) or the unguarded array branch

Affected versions

Enter an installed version to get a verified affected / not-affected result against the ranges below.

  • go github.com/getkin/kin-openapi>= 0.136.0, < 0.149.0
  • go github.com/getkin/kin-openapi>=0.136.0 <0.149.0
  • golang github.comversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-100353

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-100353

    30-day exploitation probability 0.3%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-vrcc-3ch7-hppw

    kin-openapi: Incomplete Fix for GHSA-p6wj-qrr4-pgh5: Three Unpatched nil-Items Panic Paths in openapi3filter

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-100353

    The fix for GHSA-p6wj-qrr4-pgh5 addressed a nil-pointer dereference that occurs when an OpenAPI 3.1 array schema omits the items keyword (which is legal under JSON Schema 2020-12). That fix patched three decoder paths: the standalone parseArray function, the top-level array check in UrlencodedBodyDecoder, and MultipartBodyDecoder. Three additional crash paths were missed. All of them reach the ung

    advisories.gitlab.com
  • GitLab Advisory DatabasePackage advisorygo/github.com/getkin/kin-openapi/CVE-2026-100353.yml

    The fix for GHSA-p6wj-qrr4-pgh5 addressed a nil-pointer dereference + that occurs when an OpenAPI 3.1 array schema omits the keyword (which is + legal under JSON Schema 2020-12). That fix patched three decoder paths: the standalone + function, the top-level array check in , and + .\n\nThree additional crash paths were missed. All of them + reach the unguarded method (`openapi3filter/req_resp_deco

    gitlab.com
  • NIST NVDVulnerability recordCVE-2026-100353

    kin-openapi is a Go project for handling OpenAPI files. From 0.136.0 until 0.149.0, three openapi3filter decoder paths that were missed by the fix for GHSA-p6wj-qrr4-pgh5 lack a nil-items guard for legal OpenAPI 3.1 array schemas. An unauthenticated remote client can trigger a de

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.